Okay, here we have this:
We need to calculate the width of a rectangle, considering that the area is 99 square inches, and the lenght is 2 in longer than the width (x), so let's replace in the following formula:
Area of rectangle=Lenght*width
99 square in=(x+2)*(x)
Now, let's solve for x:
99=(x+2)(x)
99=x²+2x
99-99=x²+2x-99
x²+2x-99=0
(x-9)(x+11)=0
x-9=0 or x+11=0
x=9 or x=-11
Here, we obtain two values, and as this measure cannot be negative, we discard -11. Finally we get that the width of the rectangle is 9 inches