Question

valor numerico do polinômio P(×)=2×*5+×*4-2×*2-× , para ×=-1

Answer 1

$P(x)=2x*5+x*4-2x*2-x\\\\P(x)=10x+4x-4x-x\\\\P(x)=9x\\\\P(-1)=9*(-1)\\\\\boxed{P(-1)=-9}$

Answer 2

Vamos lá :

P(x)=2x*5+x*4 - 2x*2 - x

P(x) = 10x + 4x - 4x - x

P(x) = 10x - x

P(x) = 9.x

x = - 1

P(- 1) = 9.(- 1)
P(- 1) = - 9

Espero ter ajudado  !!!