Question

determine o valor da expressão: 2.x³-(1-x)²-1/4+x enquanto x=-2

Answer 1

Resposta:

Explicação passo-a-passo:

Para x = -2 teremos

$2.(-2)^{3} -(1-(-2))^{2}-\dfrac{1}{4}+(-2)=\\\\\\=2.(-8)-(1+2)^{2}-\dfrac{1}{4}-2=\\\\=-16-(3)^{2}-\dfrac{1}{4}-2=\\\\=-16-9-\dfrac{1}{4}-2=-27-\dfrac{1}{4}=\\\\=\dfrac{-108-1}{4}=\dfrac{-109}{4}$