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April 20, 2014

April 20, 2014

Posted by **jeanne** on Sunday, December 9, 2012 at 8:36pm.

- math/algebra -
**Bosnian**, Sunday, December 9, 2012 at 11:13pmL = W + 5

A = L * W

( W + 5 ) * W = 66

W ^ 2 + 5 W = 66

W ^ 2 + 5 W - 66 = 0

Solutions of equation are :

W = - 11

and

W = 6

Length can't be negative so :

W = 6 cm

Proof:

L = W + 5 = 6 + 5 = 11

A = L * W = 11 * 6 = 66 cm ^ 2

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