Encontre o domínio de existência das seguintes funções: f(x) = 1 - 3x - x^2

Passo 1

Beleza, vamos lá! O enunciado pede para encontrar o domínio de existência da função . O domínio de uma função é basicamente o conjunto de todos os valores de para os quais a função está definida. Para resolver isso, vamos precisar saber um pouco sobre funções polinomiais e como elas se comportam.

Passo 2

Primeiro, vamos identificar que tipo de função estamos lidando. A função dada é um polinômio, já que é formada por termos com potências inteiras não negativas de . Especificamente, temos:
Funções polinomiais são bem legais porque elas são definidas para todos os números reais. Isso significa que não há restrições sobre os valores que pode assumir.

Passo 3

Agora, vamos lembrar o que significa o domínio de existência. O domínio é o conjunto de todos os valores de que tornam a função bem definida, ou seja, para os quais não temos problemas como dividir por zero, tirar raízes de números negativos (no caso de funções que envolvem raízes quadradas, por exemplo), entre outras situações.

Passo 4

No caso de polinômios, como o nosso , não temos nenhum denominador que possa ser zero, nem raízes quadradas ou logaritmos que impuseriam restrições sobre . Portanto, a função está definida para qualquer valor real de .

Passo 5

Então, concluindo, o domínio da função é todo o conjunto dos números reais. Em notação matemática, escrevemos isso como:
í

Resposta

O domínio de existência da função é todo o conjunto dos números reais, ou seja:
í

Exercícios relacionados

O que é uma função? Comente usando os conceitos de domínio, contradomínio, conjunto imagem e lei de associação. Dê dois exemplos.
<html><head></head><body><div>Encontre o domínio de existência das seguintes funções: <span class="math-inline ">
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<html><head></head><body><div>Encontre o domínio de existência das seguintes funções: <span class="math-inline ">
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<html><head></head><body><div>Encontre o domínio de existência das seguintes funções: <span class="math-inline ">
<mjx-container class=“MathJax” jax=“SVG”><svg style=“vertical-align: -1.236ex;” xmlns=“
http://www.w3.org/2000/svg” width=“9.36ex” height=“3.129ex” role=“img” focusable=“false” viewBox=“0 -836.6 4137 1383”><title>h(t) = t/|t|</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=“210E” d=“M137 683Q138 683 209 688T282 694Q294 694 294 685Q294 674 258 534Q220 386 220 383Q220 381 227 388Q288 442 357 442Q411 442 444 415T478 336Q478 285 440 178T402 50Q403 36 407 31T422 26Q450 26 474 56T513 138Q516 149 519 151T535 153Q555 153 555 145Q555 144 551 130Q535 71 500 33Q466 -10 419 -10H414Q367 -10 346 17T325 74Q325 90 361 192T398 345Q398 404 354 404H349Q266 404 205 306L198 293L164 158Q132 28 127 16Q114 -11 83 -11Q69 -11 59 -2T48 16Q48 30 121 320L195 616Q195 629 188 632T149 637H128Q122 643 122 645T124 664Q129 683 137 683Z”></path></g><g data-mml-node=“mo” transform=“translate(576,0)”><path data-c=“28” d=“M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z”></path></g><g data-mml-node=“mi” transform=“translate(965,0)”><path data-c=“1D461” d=“M26 385Q19 392 19 395Q19 399 22 411T27 425Q29 430 36 430T87 431H140L159 511Q162 522 166 540T173 566T179 586T187 603T197 615T211 624T229 626Q247 625 254 615T261 596Q261 589 252 549T232 470L222 433Q222 431 272 431H323Q330 424 330 420Q330 398 317 385H210L174 240Q135 80 135 68Q135 26 162 26Q197 26 230 60T283 144Q285 150 288 151T303 153H307Q322 153 322 145Q322 142 319 133Q314 117 301 95T267 48T216 6T155 -11Q125 -11 98 4T59 56Q57 64 57 83V101L92 241Q127 382 128 383Q128 385 77 385H26Z”></path></g><g data-mml-node=“mo” transform=“translate(1326,0)”><path data-c=“29” d=“M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z”></path></g><g data-mml-node=“mo” transform=“translate(1992.8,0)”><path data-c=“3D” d=“M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z”></path></g><g data-mml-node=“mfrac” transform=“translate(3048.6,0)”><g data-mml-node=“mi” transform=“translate(416.6,394) scale(0.707)”><path data-c=“1D461” d=“M26 385Q19 392 19 395Q19 399 22 411T27 425Q29 430 36 430T87 431H140L159 511Q162 522 166 540T173 566T179 586T187 603T197 615T211 624T229 626Q247 625 254 615T261 596Q261 589 252 549T232 470L222 433Q222 431 272 431H323Q330 424 330 420Q330 398 317 385H210L174 240Q135 80 135 68Q135 26 162 26Q197 26 230 60T283 144Q285 150 288 151T303 153H307Q322 153 322 145Q322 142 319 133Q314 117 301 95T267 48T216 6T155 -11Q125 -11 98 4T59 56Q57 64 57 83V101L92 241Q127 382 128 383Q128 385 77 385H26Z”></path></g><g data-mml-node=“mrow” transform=“translate(220,-370) scale(0.707)”><g data-mml-node=“mo” transform=“translate(0 -0.5)”><path data-c=“7C” d=“M139 -249H137Q125 -249 119 -235V251L120 737Q130 750 139 750Q152 750 159 735V-235Q151 -249 141 -249H139Z”></path></g><g data-mml-node=“mi” transform=“translate(278,0)”><path data-c=“1D461” d=“M26 385Q19 392 19 395Q19 399 22 411T27 425Q29 430 36 430T87 431H140L159 511Q162 522 166 540T173 566T179 586T187 603T197 615T211 624T229 626Q247 625 254 615T261 596Q261 589 252 549T232 470L222 433Q222 431 272 431H323Q330 424 330 420Q330 398 317 385H210L174 240Q135 80 135 68Q135 26 162 26Q197 26 230 60T283 144Q285 150 288 151T303 153H307Q322 153 322 145Q322 142 319 133Q314 117 301 95T267 48T216 6T155 -11Q125 -11 98 4T59 56Q57 64 57 83V101L92 241Q127 382 128 383Q128 385 77 385H26Z”></path></g><g data-mml-node=“mo” transform=“translate(639,0) translate(0 -0.5)”><path data-c=“7C” d=“M139 -249H137Q125 -249 119 -235V251L120 737Q130 750 139 750Q152 750 159 735V-235Q151 -249 141 -249H139Z”></path></g></g><rect width=“848.4” height=“60” x=“120” y=“220”></rect></g></g></g></svg></mjx-container></span></div>
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