SOLUTION: This is the problem I was given. Can anyone help explain the solution to me - please. A square picture frame contains a picture with a mat border. The border is 3 inches

Question 162720: This is the problem I was given. Can anyone help explain the solution to me - please.

A square picture frame contains a picture with a mat border.
The border is 3 inches thick on the sides and 4 inches thick
on the top and bottom. If the area exposed within the mat border
is 528 square inches, what are the dimensions of the original
frame?
x^2-14x-480 = 0
Answer by vleith(2983) (Show Source): You can put this solution on YOUR website!
Let the sides of the frame be X. Then the inside dimensions on the mat are (x-6) and (x-8).

So X is either 30 or -16. I can't be negative, so it must be a 30x30 picture frame

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