Question

25 (a+b)-16(a-b)²

5²(a+b)-4²(a-b)²
(5(a+b))²-(4(a-b))²
(5a+5b)²-(4a-4b)²
[(5a+5b)+(4a-4b)] [(5a+5b)-(4a-4b)]
(5a+5b+4a-4b)(5a+5b-4a+4b)
=(9a+b)(a+9b)​

Answer 1

Answer:

simplifying 25(a+b)-16(a-b)^2