Question

simplifique a expresao (7x+y)^2+(7x+y).(7x-y)

Answer 1

(7x+y)(7x+y)+(7x+y)(7x-y)=
=(7x+y)[(7x+y)+(7x-y)]
=(7x+y)(7x+y+7x-y)

=(7x+y)(14x)
ou
=98x^2 + 14xy


Espero ter ajudado :)