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January 29, 2015

January 29, 2015

Posted by **Meg** on Sunday, May 12, 2013 at 11:32pm.

- Trig -
**Steve**, Sunday, May 12, 2013 at 11:53pm4x+y = 84, so

y = 84-4x

v = x^2 y = x^2(84-4x) = 84x^2 - 4x^3

dv/dx = 168x - 12x^2

= 12x(14-x)

dv/dx=0 when x=14

so the box is 14 x 14 x 28

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