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October 21, 2014

October 21, 2014

Posted by **jke** on Thursday, February 4, 2010 at 10:28am.

- maths -
**drwls**, Thursday, February 4, 2010 at 11:25amL W = 180

2W -L = 2

Solve for L and W

(2W -2)*W -180 = 0

2W^2 -2W -180 = 0

This is a factorabble quadratic equation.

(W^2 -W -90) = 0

(W -10)(W+9) = 0

W = 10 cm. Ignore the negative root (-9)

L = 180/W = 18

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