Question

Resolva a seguir:

a) (a - b)²
b) (a + b) . (a - b)
c) (a + b)² - 2b²

Answer 1

a) (a-b).(a-b)= a²-ab-ab+b²= a²-2ab+b²

b) (a+b).(a-b)= a²-ab+ab-b²= a²-b²

c) (a+b).(a+b) -2b²= a²+ab+ab+b²-2b²=
a²+2ab +b²-2b²= a²+2ab -b²