Question 972807
;;;;;;;; X==========+7
x+8/ x^2====+15x----+56 ;;   multiply x by x to get x^2 and x by 8 to get 8x and subtract.

==== -X^2=====-8x
subtract ==== 7x ====56
--------------7x---- 56
subtract ---- -7x   -56
no remainder

The quotient is x+7

(x+7)(x+8)= x^2 +15x +56