Question

(x+3)2 - (x+2)(x-2) - (2x - 1)2

Answer 1

Resposta:

x2+6x+9-x2+2x-2x+4-4x2+4x-1=

-4x2+10x+12=0

2x2-5x-6=0

Explicação passo-a-passo:

x=(5+-√25-4×2×-6)/4

x=(5+-√73)/4

x=(5+8,5)/4

x=13,5/4

x=3,37

x=(5-8,5)/4

x=-3,5/4

x=-0,875