Determine: Os extremos relativos de f.

Passo 1

Beleza, vamos lá! A questão é encontrar os extremos relativos da função . Isso faz parte do estudo de Cálculo Diferencial, especificamente do tópico de derivadas. Para resolver isso, vamos precisar calcular a derivada da função e analisar onde ela é igual a zero ou não está definida. Esses pontos são candidatos a serem extremos relativos (máximos ou mínimos).

Passo 2

Primeiro, vamos encontrar a derivada da função , que é representada por . A derivada nos ajuda a entender a inclinação da função em cada ponto.

Passo 3

Depois de encontrar , vamos resolver a equação . Os valores de que satisfazem essa equação são chamados pontos críticos e são onde podem ocorrer os extremos relativos.

Passo 4

Além disso, precisamos verificar onde a derivada não está definida, pois esses pontos também podem ser candidatos a extremos.

Passo 5

Com os pontos críticos em mãos, vamos analisar o comportamento da função nessas regiões. Podemos usar o Teste da Primeira Derivada ou o Teste da Segunda Derivada para determinar se cada ponto crítico é um máximo relativo, um mínimo relativo ou nenhum dos dois.

Passo 6

Teste da Primeira Derivada: Observamos o sinal de antes e depois de cada ponto crítico:
  • Se muda de positivo para negativo, temos um máximo relativo.
  • Se muda de negativo para positivo, temos um mínimo relativo.
  • Se não há mudança de sinal, não é um extremo.
Teste da Segunda Derivada: Calculamos :
  • Se no ponto crítico, é um mínimo relativo.
  • Se no ponto crítico, é um máximo relativo.
  • Se , o teste é inconclusivo.

Passo 7

Após identificar os pontos onde ocorrem os extremos relativos usando os testes acima, concluímos quais são os valores de onde atinge máximos e mínimos locais.

Resposta

Os extremos relativos de ocorrem nos pontos críticos onde a derivada é zero ou não está definida, e são classificados como máximos ou mínimos relativos de acordo com o comportamento da derivada nesses pontos.

Exercícios relacionados

<html><head></head><body><div>Determine o domínio, as assíntotas horizontais, verticais <span class="math-inline " data-overflow=“visible”>
<mjx-container class=“MathJax” jax=“SVG”><svg style=“vertical-align: -0.014ex;” xmlns=“
http://www.w3.org/2000/svg” width=“1.192ex” height=“1.036ex” role=“img” focusable=“false” viewBox=“0 -452 527 458”><title>e</title><g stroke=“currentColor” fill=“currentColor” stroke-width=“0” transform=“scale(1,-1)”><g data-mml-node=“math”><g data-mml-node=“TeXAtom” data-mjx-texclass=“ORD”><g data-mml-node=“mi”><path data-c=“1D41E” d=“M32 225Q32 332 102 392T272 452H283Q382 452 436 401Q494 343 494 243Q494 226 486 222T440 217Q431 217 394 217T327 218H175V209Q175 177 179 154T196 107T236 69T306 50Q312 49 323 49Q376 49 410 85Q421 99 427 111T434 127T442 133T463 135H468Q494 135 494 117Q494 110 489 97T468 66T431 32T373 5T292 -6Q181 -6 107 55T32 225ZM383 276Q377 346 348 374T280 402Q253 402 230 390T195 357Q179 331 176 279V266H383V276Z”></path></g></g></g></g></svg></mjx-container></span> inclinadas, os pontos extremos e de inflexão, as regiões de crescimento e decrescimento, as concavidades e faça o gráfico das seguintes funções:<br>
<span class="math-inline ">
<mjx-container class=“MathJax” jax=“SVG”><svg style=“vertical-align: -0.791ex;” xmlns=“http://www.w3.org/2000/svg” width=“25.705ex” height=“2.713ex” role=“img” focusable=“false” viewBox=“0 -849.5 11361.8 1199”><title>f(x) = tg^2(x), x ∈ (-pi/2, pi/2)</title><g stroke=“currentColor” fill=“currentColor” stroke-width=“0” transform=“scale(1,-1)”><g data-mml-node=“math”><g data-mml-node=“mi”><path data-c=“1D453” d=“M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 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</body></html>
<html><head></head><body><div>Determine o domínio, as assíntotas horizontais, verticais <span class="math-inline " data-overflow=“visible”>
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<span class="math-inline ">
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175T169 130Q169 119 166 110T159 94T148 82T136 74T126 70T118 67L114 66Q165 21 238 21Q293 21 321 74Q338 107 338 175V195Q338 290 274 322Q259 328 213 329L171 330L168 332Q166 335 166 348Q166 366 174 366Q202 366 232 371Q266 376 294 413T322 525V533Q322 590 287 612Q265 626 240 626Q208 626 181 615T143 592T132 580H135Q138 579 143 578T153 573T165 566T175 555T183 540T186 520Q186 498 172 481T127 463Z”></path></g><rect width=“913.2” height=“60” x=“120” y=“220”></rect></g><g data-mml-node=“mo” transform=“translate(6766.9,0)”><path data-c=“2212” d=“M84 237T84 250T98 270H679Q694 262 694 250T679 230H98Q84 237 84 250Z”></path></g><g data-mml-node=“mfrac” transform=“translate(7767.2,0)”><g data-mml-node=“mn” transform=“translate(220,394) scale(0.707)”><path data-c=“33” d=“M127 463Q100 463 85 480T69 524Q69 579 117 622T233 665Q268 665 277 664Q351 652 390 611T430 522Q430 470 396 421T302 350L299 348Q299 347 308 345T337 336T375 315Q457 262 457 175Q457 96 395 37T238 -22Q158 -22 100 21T42 130Q42 158 60 175T105 193Q133 193 151 175T169 130Q169 119 166 110T159 94T148 82T136 74T126 70T118 67L114 66Q165 21 238 21Q293 21 321 74Q338 107 338 175V195Q338 290 274 322Q259 328 213 329L171 330L168 332Q166 335 166 348Q166 366 174 366Q202 366 232 371Q266 376 294 413T322 525V533Q322 590 287 612Q265 626 240 626Q208 626 181 615T143 592T132 580H135Q138 579 143 578T153 573T165 566T175 555T183 540T186 520Q186 498 172 481T127 463Z”></path></g><g data-mml-node=“mn” transform=“translate(220,-345) scale(0.707)”><path data-c=“32” d=“M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z”></path></g><rect width=“553.6” height=“60” x=“120” y=“220”></rect></g><g data-mml-node=“msup” transform=“translate(8560.7,0)”><g data-mml-node=“mi”><path data-c=“1D465” d=“M52 289Q59 331 106 386T222 442Q257 442 286 424T329 379Q371 442 430 442Q467 442 494 420T522 361Q522 332 508 314T481 292T458 288Q439 288 427 299T415 328Q415 374 465 391Q454 404 425 404Q412 404 406 402Q368 386 350 336Q290 115 290 78Q290 50 306 38T341 26Q378 26 414 59T463 140Q466 150 469 151T485 153H489Q504 153 504 145Q504 144 502 134Q486 77 440 33T333 -11Q263 -11 227 52Q186 -10 133 -10H127Q78 -10 57 16T35 71Q35 103 54 123T99 143Q142 143 142 101Q142 81 130 66T107 46T94 41L91 40Q91 39 97 36T113 29T132 26Q168 26 194 71Q203 87 217 139T245 247T261 313Q266 340 266 352Q266 380 251 392T217 404Q177 404 142 372T93 290Q91 281 88 280T72 278H58Q52 284 52 289Z”></path></g><g data-mml-node=“TeXAtom” transform=“translate(605,363) scale(0.707)” data-mjx-texclass=“ORD”><g data-mml-node=“mn”><path data-c=“32” d=“M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z”></path></g></g></g></g></g></svg></mjx-container></span></div>
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<html><head></head><body><div>Determine: Os intervalos nos quais <span class="math-inline " data-overflow=“visible”>
<mjx-container class=“MathJax” jax=“SVG”><svg style=“vertical-align: -0.464ex;” xmlns=“
http://www.w3.org/2000/svg” width=“1.244ex” height=“2.059ex” role=“img” focusable=“false” viewBox=“0 -705 550 910”><title>f</title><g stroke=“currentColor” fill=“currentColor” stroke-width=“0” transform=“scale(1,-1)”><g data-mml-node=“math”><g data-mml-node=“mi”><path data-c=“1D453” d=“M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z”></path></g></g></g></svg></mjx-container></span> é decrescente.</div>
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<html><head></head><body><div><span class="math-inline ">
<mjx-container class=“MathJax” jax=“SVG”><svg style=“vertical-align: -0.781ex;” xmlns=“
http://www.w3.org/2000/svg” width=“20.02ex” height=“3.019ex” role=“img” focusable=“false” viewBox=“0 -989.2 8848.7 1334.2”><title>f(x) = x^4/4 - x^3 + x^2</title><g stroke=“currentColor” fill=“currentColor” stroke-width=“0” transform=“scale(1,-1)”><g data-mml-node=“math”><g data-mml-node=“mi”><path data-c=“1D453” d=“M118 -162Q120 -162 124 -164T135 -167T147 -168Q160 -168 171 -155T187 -126Q197 -99 221 27T267 267T289 382V385H242Q195 385 192 387Q188 390 188 397L195 425Q197 430 203 430T250 431Q298 431 298 432Q298 434 307 482T319 540Q356 705 465 705Q502 703 526 683T550 630Q550 594 529 578T487 561Q443 561 443 603Q443 622 454 636T478 657L487 662Q471 668 457 668Q445 668 434 658T419 630Q412 601 403 552T387 469T380 433Q380 431 435 431Q480 431 487 430T498 424Q499 420 496 407T491 391Q489 386 482 386T428 385H372L349 263Q301 15 282 -47Q255 -132 212 -173Q175 -205 139 -205Q107 -205 81 -186T55 -132Q55 -95 76 -78T118 -61Q162 -61 162 -103Q162 -122 151 -136T127 -157L118 -162Z”></path></g><g 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404Q412 404 406 402Q368 386 350 336Q290 115 290 78Q290 50 306 38T341 26Q378 26 414 59T463 140Q466 150 469 151T485 153H489Q504 153 504 145Q504 144 502 134Q486 77 440 33T333 -11Q263 -11 227 52Q186 -10 133 -10H127Q78 -10 57 16T35 71Q35 103 54 123T99 143Q142 143 142 101Q142 81 130 66T107 46T94 41L91 40Q91 39 97 36T113 29T132 26Q168 26 194 71Q203 87 217 139T245 247T261 313Q266 340 266 352Q266 380 251 392T217 404Q177 404 142 372T93 290Q91 281 88 280T72 278H58Q52 284 52 289Z”></path></g><g data-mml-node=“TeXAtom” transform=“translate(605,363) scale(0.707)” data-mjx-texclass=“ORD”><g data-mml-node=“mn”><path data-c=“34” d=“M462 0Q444 3 333 3Q217 3 199 0H190V46H221Q241 46 248 46T265 48T279 53T286 61Q287 63 287 115V165H28V211L179 442Q332 674 334 675Q336 677 355 677H373L379 671V211H471V165H379V114Q379 73 379 66T385 54Q393 47 442 46H471V0H462ZM293 211V545L74 212L183 211H293Z”></path></g></g></g><g data-mml-node=“mn” transform=“translate(399.8,-345) scale(0.707)”><path data-c=“34” d=“M462 0Q444 3 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143Q142 143 142 101Q142 81 130 66T107 46T94 41L91 40Q91 39 97 36T113 29T132 26Q168 26 194 71Q203 87 217 139T245 247T261 313Q266 340 266 352Q266 380 251 392T217 404Q177 404 142 372T93 290Q91 281 88 280T72 278H58Q52 284 52 289Z”></path></g><g data-mml-node=“TeXAtom” transform=“translate(605,363) scale(0.707)” data-mjx-texclass=“ORD”><g data-mml-node=“mn”><path data-c=“33” d=“M127 463Q100 463 85 480T69 524Q69 579 117 622T233 665Q268 665 277 664Q351 652 390 611T430 522Q430 470 396 421T302 350L299 348Q299 347 308 345T337 336T375 315Q457 262 457 175Q457 96 395 37T238 -22Q158 -22 100 21T42 130Q42 158 60 175T105 193Q133 193 151 175T169 130Q169 119 166 110T159 94T148 82T136 74T126 70T118 67L114 66Q165 21 238 21Q293 21 321 74Q338 107 338 175V195Q338 290 274 322Q259 328 213 329L171 330L168 332Q166 335 166 348Q166 366 174 366Q202 366 232 371Q266 376 294 413T322 525V533Q322 590 287 612Q265 626 240 626Q208 626 181 615T143 592T132 580H135Q138 579 143 578T153 573T165 566T175 555T183 540T186 520Q186 498 172 481T127 463Z”></path></g></g></g><g data-mml-node=“mo” transform=“translate(6839.9,0)”><path data-c=“2B” d=“M56 237T56 250T70 270H369V420L370 570Q380 583 389 583Q402 583 409 568V270H707Q722 262 722 250T707 230H409V-68Q401 -82 391 -82H389H387Q375 -82 369 -68V230H70Q56 237 56 250Z”></path></g><g data-mml-node=“msup” transform=“translate(7840.2,0)”><g data-mml-node=“mi”><path data-c=“1D465” d=“M52 289Q59 331 106 386T222 442Q257 442 286 424T329 379Q371 442 430 442Q467 442 494 420T522 361Q522 332 508 314T481 292T458 288Q439 288 427 299T415 328Q415 374 465 391Q454 404 425 404Q412 404 406 402Q368 386 350 336Q290 115 290 78Q290 50 306 38T341 26Q378 26 414 59T463 140Q466 150 469 151T485 153H489Q504 153 504 145Q504 144 502 134Q486 77 440 33T333 -11Q263 -11 227 52Q186 -10 133 -10H127Q78 -10 57 16T35 71Q35 103 54 123T99 143Q142 143 142 101Q142 81 130 66T107 46T94 41L91 40Q91 39 97 36T113 29T132 26Q168 26 194 71Q203 87 217 139T245 247T261 313Q266 340 266 352Q266 380 251 392T217 404Q177 404 142 372T93 290Q91 281 88 280T72 278H58Q52 284 52 289Z”></path></g><g data-mml-node=“TeXAtom” transform=“translate(605,363) scale(0.707)” data-mjx-texclass=“ORD”><g data-mml-node=“mn”><path data-c=“32” d=“M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z”></path></g></g></g></g></g></svg></mjx-container></span></div>
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