Answer
x=3, -3, or 0.5
Work Step by Step
2x$^3$-x$^2$-18x+9=0
x$^2$(2x-1)-9(2x-1)=0
(x$^2$-9)(2x-1)=0
(x+3)(x-3)(2x-1)=0
x=-3, 3, or 0.5
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