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November 22, 2014

November 22, 2014

Posted by **saman** on Friday, February 7, 2014 at 3:30pm.

- math -
**Damon**, Friday, February 7, 2014 at 3:50pmL + 2 W = 120 so L = 120 - 2 W

A = L W

A = (120-2W)W = 120 W - 2 W^2

so

2 W^2 -120 W = - A

W^2 - 60 W = -A/2

W^2 - 60 W + 900 = -A/2 + 900

(W-30)^2 = -(1/2)(A-1800)

vertax of parabola at (30,1800)

so

W = 30

L = 120 - 60 = 60

and A = 1800 m^2

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