Question

Sendo f(x) 5x dois ao quadrado -2 então calcule ; f(2)-f(3)
2

Answer 1

Resposta:

-25

Explicação passo-a-passo:

f(x)=5x^2

f(2)=5.2^2=5.4=20

f(3)=5.3^2=5.9=45

f(2) - f(3)

20 - 45

-25

Answer 2

$\Large\mathsf\displaystyle{}f\left(x\right) = 5 {x}^{2} - 2$

Vamos lá:

$\Large\mathsf\displaystyle{}f\left(2\right) = 5\cdot {2}^{2} - 2 \\ \Large\mathsf\displaystyle{}f\left(2\right) = 5\cdot4 - 2 \\ \Large\mathsf\displaystyle{}f\left(2\right) = 20 - 2 \\ \Large\mathsf\displaystyle{}f\left(2\right) = 18$

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$\Large\mathsf\displaystyle{}f\left(3\right) = 5\cdot {3}^{2} - 2 \\\Large\mathsf\displaystyle{}f \left(3\right) = 5\cdot9 - 2 \\ \Large\mathsf\displaystyle{}f\left(3\right) = 45 - 2 \\ \Large\mathsf\displaystyle{}f\left(3\right) = 43$

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