Math

a textbook page measures 6 inches by 9 inches. there is a margin of uniform width around all four sides of the page leaving 28 square inches for printing. find the width and height of the printing area

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asked by Kim
  1. (6-2w)(9-2w) = 28
    4w^2 - 30w + 54 = 28
    4w^2 - 30w + 26 = 0
    (2w-13)(2w-2) = 0
    w = 2 or 13/2

    13/2 is too big, since the book is only 6" wide.

    so, the border is 1" wide.
    check: 4x7 = 28

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    posted by Steve

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