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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.
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.
Area=45 sq units
a) Area=length * width=(x+6)(x-6)=(x^2-36) (difference of two squares)
x=-9 (reject, dimension>0)
c) length=x+6=9+6=15 units