Question

a plus b the whole square is equal to

Answer 1

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

Answer 2

here let's symbolize square as '•' instead of 2 as the big 2 will confuse you .
(a+b)• = a• + 2*a*b + b•
in words :- a plus b whole square is equal to a square plus 2 x a x b plus b square.