Question

7a(2a+5b)+7a(2a-5b)​

Answer 1

Answer:

7a(2a-5b)^2

hope it will help you

Answer 2

$({14a }^ {2} + 35ab )+ ( {14a}^{2} - 35ab) \\ = ({49a}^{2} b ) + ( - 21ab) \\ = {49a}^{2} b - 21ab \\ = 28a \: ans$

this is your answer