Question

Me ajudem a resolver :)

Answer 1

Resposta:

P(2)=13

Explicação passo-a-passo:

$P(x)=det\left[\begin{array}{ccc}x(x+1)&-1\\-x-3&x+1\end{array}\right] \\\\\\P(x)=x(x+1)(x+1)-(-1)(-x-3)\\P(x)=x(x^2+2x+1)-x-3\\P(x)=x^3+2x^2+x-x-3\\P(x)=x^3+2x^2-3\\\\Para~P(2):\\P(2)=2^3+2(2)^2-3\\P(2)=8+8-3\\P(2)=13$