Posted by **Yoona** on Sunday, December 18, 2011 at 11:28pm.

1. A sheet of cardboard 3 ft. by 4 ft. will be made into a box by cutting equal-sized squares from each corner and folding up the four edges. What will be the dimensions of the box with largest volume?

so I did V=lhw

and found l=4-2h and w=3-2h

I also distributed them in the equation

I found V= and found the derivative

v'=12-28h+12h^2 and I set it equal to zero

from there...I dont know whay to do.

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