Question

Calcule o valor de (b + c)2, sabendo que b2 + c2 = 7,65 e b.c = 3,78.

Answer 1

(b+c)^2=
(b+c).(b+c)=
b^2+bc+bc+c^2=
b^2+2bc+c^2=
(b^2+c^2)+2.bc=
7,65+2.3,78=
7,65+7,56=
15,21