Question

RESULTADO DE (x + a)(x - a)= 36² - a²

Answer 1

$(x+a).(x-a)~=~36^2-a^2\\\\\\x\,.\,x~-~x\,.\,a~+~x\,.\,a~-~a^2~=~36^2-a^2\\\\\\x^2~-~xa~+~xa~-~a^2~+~a^2~=~36^2\\\\\\x^2~=~36^2\\\\\\x~=~\pm\sqrt{36^2}\\\\\\\boxed{x~=~\pm36}\\\\ou\\\\S=\{x\in\Re~|~x=36~ou~x=-36\}$

Answer 2

Resposta:

(x + a)(x - a)= 36² - a²

x²-a²=36²-a²

x²=36²  ==>x=36   ou x=-36

-a²=-a² ==> a ∈ Reais