Question

(a+b)^2-(a-b) ^2
Is equal to?

Answer 1

Answer:

(a+b)^2= a^2 +b^2 +2ab

(a-b)^2= a^2 +b^2 -2ab

so when we subtract it we will get 4ab

Answer 2

Answer:

(a+b) ^2-(a-b)^2

=a^2+b^2+2ab-(a^2+b^2-2ab)

=a^2+b^2+2ab-a^2-b^2+2ab

=a^2-a^2+b^2-b^2+2ab+2ab

=0+0+4ab

=4ab