computer manufacturing company would like to come up with a new laptop
computer such that its monitor is 80 a square inches smaller than the present ones.
Suppose the length of the monitor of the larger computer is 5 inches longer than
its width and the area of the smaller computer is 70 square inches. What are the
dimensions of the monitor of the larger computer?

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  1. If the larger monitor has width w, then its length is w+5. So, we have

    w(w+5)-80 = 70
    w^2 + 5w - 150 = 0
    (w+15)(w-10) = 0

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    posted by Steve

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