Question

Se F(x)= 2x²-1 então F(0)+ F(-1)+ F(2) é?

Answer 1

$\large\sf{}f(x) = 2 {x}^{2} - 1$

Vamos lá:

$\large\sf{}f(0) = 2 \times {0}^{2} - 1 \\ \large\sf{}f(0) = 2 \times 0 - 1 \\ \large\sf{}f(0) = 0 - 1 \\\large\sf{}f(0) = - 1$

$\large\sf{}f( - 1) = 2 \times \left( - 1\right)^{2} - 1 \\ \large\sf{}f( - 1) = 2 \times 1 - 1 \\ \large\sf{}f( - 1) = 2 - 1 \\ \large\sf{}f( - 1) = 1$

$\large\sf{}f(2) = 2 \times {2}^{2} - 1 \\ \large\sf{}f(2) = 2 \times 4 - 1 \\ \large\sf{}f(2) = 8 - 1 \\ \large\sf{}f(2) = 7$

$\large\sf{}Soma$

$\large\sf{}-1+1+7$

${\large\boxed{\boxed{  { \large \sf 7}}}}$

${\large\boxed{\boxed{  { \large \sf Bons~Estudos }}}}$

Answer 2

Resposta

Explicação passo a passo: Apenas substuir o x na função lindo, pelas as raizes e somar

F(0) = 2.0² - 1 = -1

F(-1) = 2.-1² - 1 = 1

F(2)  = 2.2² - 1 = 7

Agora

-1 + 1 + 7 = 7