Question

resolva: (x + 1)² - (x - 1)² - (1 - x)²

Answer 1

Resposta:

(x+1)2-(x-1)2-(1-x)2=

x2+2x+1-x2+2x+1-1+2x+x2=

x2+6x+1=

x=(-6+-√36-4.1.1)/2

x=(-6+-√32)/2#