Question

(×+b) (x-b)=x (2b+x)

Answer 1

Resolução:

( x + b ).( x - b ) = x ( 2b + x )

x² - bx + bx - b² = 2bx + x²

x² - x² - b²- bx + bx - 2bx = 0

0 - b² - 0 - 2bx = 0

-b² - 2bx = 0


RESPOSTA → -b² - 2bx = 0