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March 6, 2015

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Posted by **Melanie** on Friday, July 15, 2011 at 4:51pm.

- College Algebra -
**bobpursley**, Friday, July 15, 2011 at 5:51pmPerimeter = 3w+4L=100

area= 2LW

but W=(100-4L)/3

area=2L (100-4L)/3

take the derivative with respect to L, set to zero, and solve for L, then go back and find W.

- College Algebra -
**bobpursley**, Friday, July 15, 2011 at 5:54pmOoops. You are not a calculus student yet.

area=2L(100-4L)/3= 200L/3 -8L^2/3

This is a parabola, with zeroes at L=25, and L=0. So max must be halfway between, L=25/2

if L = 25/2 then W=(100-50)/3 and that is it.

- College Algebra -
**Melanie**, Friday, July 15, 2011 at 6:41pmThank you bobpursley!

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