Question

$( - a - c) {}^{2}$
alguém sabe ? preciso urgente ​

Answer 1

$(-a-c)^2~=~(-a-c)~.~(-a-c)\\\\\\(-a-c)^2~=~(-a).(-a)~+~(-a).(-c)~+~(-c).(-a)~+~(-c).(-c)\\\\\\(-a-c)^2~=~(-a)^2~+~ac~+~ac~+~(-c)^2\\\\\\\boxed{(-a-c)^2~=~a^2~+~2ac~+~c^2}$