Question

Simplify:
(5x+2y)^2+(5x-2y)^2

Answer 1

Answer:

(5x+2y)^2+(5x+2y)^2

5x^2+2y^2+20xy+5x^2+2y^2-20xy

(by formula (a+b)^2&(a-b)^2)

(-20xy & +20xy gets canceled)

5x^2+2y^2+5x^2+2y^2

10x^2+4y^2

hope it helps.