Question

35. Se (x + y) = -9 e (x - y)= -4, então (x + y). (x - y) é:​

Answer 1

$\mathsf{(x+y)(x-y)=(-9).(-4)=36}$

Answer 2

Resposta:

(x + y) . (x - y) =

-9 . (-4) = +36