\(x^2-3x+2\)
\(=x^2-x-2x+2\)
\(=\left(x^2-x\right)-\left(2x-2\right)\)
\(=x\left(x-1\right)-2\left(x-1\right)\)
\(=\left(x-1\right)\left(x-2\right)\)
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