Question

15a sq +25b sq factories the following please solve it's

Answer 1

$15a ^{2} + 25 {b}^{2} \\ = 15 {a}^{2} + 25b^{2} + a^{2} - a^{2} \\ = 16 {a}^{2} + 25 {b}^{2} - {a}^{2} \\ = (4a)^{2} + (5b)^{2} - a^{2} \\ = (4a)^{2} + (5b + a)(5b - a)$