Question

(6a+2b)^2=? if the formula is (a+b)^2=a^2+2ab+b^2

Answer 1

(6a+2b)^2 [a^2+2ab+2b^2]
6a^2 + 2×6a+2b + 2b^2
36a^2 +24ab + 4b^2