Answer
$\{-1. 2 \}$
Work Step by Step
Given $x^4-2x^3-3x^2+4x+4=0$, we can identify it as an equation. Graph $f(x)=x^4-2x^3-3x^2+4x+4$ as shown in the figure and we can find the solution set as $\{-1. 2 \}$
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