Question

simplify (4a+3b)(9a+3b)

Answer 1

(3b)^2+(4a+9a)3b+4a×9a
9b^2+13a×3b+36a^2
9b^2+39ab+30a^2

Answer 2

(4a+3b)(9a+3b)
4a(9a+3b)+3b(9a+3b)
=36a^2+12ab+27ab+9b^2
=36a^2+39ab+9b^2