Question 463347
The area of this rectangle is 45 square units. Find its length (the horizontal side) and the width (the verticle side). Length is x+6, width is x-6 
a) Write an equation using the formula and the given information.
45= 
b) Solve the equation, giving only the solution(s) that make sense in the problem. The solution for x is_____ 
c) Use the solution to find the indicated dimensions of the figure.
Length=
Width=
...
Given:
length=(x+6)
width=(x-6)
Area=45 sq units
..
Equation:
a) Area=length * width=(x+6)(x-6)=(x^2-36) (difference of two squares)
45=x^2-36
x^2=45+36=81
...
Solution:
b)x=±√81=±9
x=9
or
x=-9 (reject, dimension>0)
..
Dimensions:
c) length=x+6=9+6=15 units
    width=x-6=9-6=3 units