Mathematics
chantalbouchard
5

A plot of land doubles in size by adding x meters to the length and x meters to the width of the land. If the original plot had an area of 200 by 300 meters, what is the value of x?

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(1) Answers
Nutter

The area of the original plot is 200 x 300 = 60000  So the problem says  (x + 200)(x + 300) = 120000  Proof: 300 x 400 = 120000  x^2 + 500x + 60000 = 120000  x^2 + 500x - 60000 = 0  (x + 600)(x - 100) = 0, so  x = - 600 (reject), x = 100  So x = 100 meters  Proof: 300 x 400 = 120000

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