Answer
x=-3, 3, or -2
Work Step by Step
x$^3$+2x$^2$=9x+18
x$^3$+2x$^2$-9x-18=0
x$^2$(x+2)-9(x+2)=0
(x$^2$-9)(x+2)=0
(x+3)(x-3)(x+2)=0
x=-3, 3, or -2
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