Question

(a+b)=a²+2ab+b²
(a+b)=a²-2ab+b²
(a+b)(a-b)=a²-b² by geometrically

Answer 1

Answer:

1)a(a+b)+b(a+b)

= a²+ab+ba +b²

=a²+ab +ab+b²

=a²+2ab+b²

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

= a²-ab+ba-b²

=a²-ab-ab+b²

=a²-2ab+b²

3)a(a-b) + b(a-b)

= a²-ab+ba-b²

=a²-b²