How do I solve 108=x^3+3x^2

A rectangular prism with a square base has a volume of 108 cubic.  The height is 3 more than the side of the base.  What is the side of the base?  This leads to the equation 108=x^2(x+3)

108=x^3+3x^2

How do I solve now?
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1 Answer

x^3 +3x^2-108=0

hav a zero at x=3.943789, bi iterashun
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