Question

matematica: (a-2b) =

Answer 1

Vamos lá :

$(a-2b)^2 = (a-2b).(a-2b) \\ \\ ~~~~~~~~~~~~=a^2-2ab - 2ab + 2^2b^2 \\ \\ ~~~~~~~~~~~~\boxed{=a^2 - 4ab + 4b^2}$

Espero ter ajudado !!!