Friday
October 24, 2014

Homework Help: Pre-Calc

Posted by Ashley on Monday, September 7, 2009 at 1:38pm.

I am having a great deal of difficulty with this problem.

An open box is formed by cutting squares out of a piece of cardboard that is 16 ft by 19 ft and folding up the flaps.

a. what size corner squares should be cut to yield a box that has a volume of 175 cubic feet.

So I have this equation

x(16-2x)(19-2x)= 175
multiplied both parenthesis and got

4x^2-70x+304

multiplied the entire thing by x

4x^3-70x^2+304x=175

subtract 175

4x^3-70x^2+304x-175=0

I'm not sure what to do next. I was thinking rational root theorem but I have tried most of the roots and it hasn't worked. I am not sure how to solve something to the third power.

Thanks

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