Question

dado o polinomio f (x) = x3+4x - 5x + 2, Calcule f (5), f (3), e f (-2).

Answer 1

Resposta: Olá!

f(x)= x^3+4x-5x+2

Calcule f(5) , f(3) e f(-2)

f(5)=x^+4x-5x+2

f(5)=5^3+4.5-(5.5)+2

f(5)=125+20-25+2

f(5)=122

f(3)=x^3+4x-5x+2

f(3)=3^3+4.3-(5.3)+2

f(3)=27+12-15+2

f(3)=27-1

f(3)=26

f(-2)=x^3+4x-5x+2

f(-2)=(-2)^3+4.(-2)-(5.(-2))+2

f(-2)=-8-8+10+2

f(-2)= -16+12

f(-2)= -4

Espero ter ajudado!

Explicação passo-a-passo:

Answer 2

Olá, bom dia

Resoluções:

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$f(x) = x^3 + 4x - 5x + 2\\\\\text{Substituindo x por 5}\\\\f(5) = 5^3 + 4.(5) - 5.(5) + 2\\\\f(5) = 125 + 20 - 25 + 2\\\\\boxed{\boxed{f(5)=122}}$

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$f(x) = x^3 + 4x - 5x + 2\\\\\text{Substituindo x por 3}\\\\f(3) =3^3 + 4.(3) - 5.(3)+2\\\\f(3)=27+12-15+2\\\\\boxed{\boxed{f(3)=26}}$

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$f(x) = x^3 + 4x - 5x + 2\\\\\text{Substituindo x por -2}\\\\f(-2) = (-2)^3 + 4.(-2) - 5.(-2) + 2\\\\f(-2)=-8-8+10+2\\\\\boxed{\boxed{f(-2) =-4}}$

Bons Estudos :)