SOLUTION: The outside dimensions of a picture frame are 29cm and 30cm. The area of the picture inside the frame is 420 square centimeters. Find the width of the frame.

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Question 441897: The outside dimensions of a picture frame are 29cm and 30cm. The area of the picture inside the frame is 420 square centimeters. Find the width of the frame.
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
(30-2x)(29-2x)=420
870-118x+4x2=420
4x2-118x+450=0
(2x-50)(2x-9)=0
x=25 or 9/2
Throwing out the 25, we get the width of the frame to be 4-1/2cms..