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August 21, 2014

August 21, 2014

Posted by **Kelly** on Saturday, January 21, 2012 at 2:55am.

- Math, Quadratics -
**Damon**, Saturday, January 21, 2012 at 5:41amL + 2w = 40

so

L = 40 - 2w

A = L * w

A =(40-2 w)(w) = 40 w - 2 w^2

2 w^2 - 40 w = -A

w^2 - 20 w = -A/2

w^2 - 20 W + 100 = -A/2 + 100

(w-10)^2 = -(1/2)(A-200)

vertex at w = 10, A = 200

so L = 20

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