whole square of a+b

Question

• what is the  ‌⟨a+b⟩² 

Answer 1

(a+b)² = (a+b)(a+b)

 

= a(a) + a(b) + b(a) + b(b)

 

= a² + 2ab + b²

 

Note that a(b) = b(a) so  ab + ba = 2ab

Example:  4(3) = 12

               3(4) = 12