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05-11-2017
Mathematics

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The the length of a rectangle is 9 centimeters less than four timesfour times its width. its area is 28 square centimeters. find the dimensions of the rectangle.

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puppetlover2000 puppetlover2000

08-11-2017

Let w = width

then

5w-3 = length

w(5w-3) = 14

5w^2-3w = 14

5w^2-3w-14=0

(5w+7)(w-2) = 0

w = {-7/5, 2}

throw out the negative solution leaving

w = 2 centimeters

length:

5w-3 =5(2)-3 =10-3 = 7 centimeters

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