Answer:
Step-by-step explanation:
Symbolically, we get:
x^2 - 7
--------------
x + 3
The numerator can be factored if desired:
(x - √7)(x + √7)
-----------------------
x + 3
A very simple example is:

What you need to is just distribute x into the parenthesis, so once x times the first term (a) and once x times the second term (b)
I hope you got
the idea
The first and last term factor into (2x+7) since this is a perfect square trinomial the answer must be 28