Multiply the single term $-2$ by each term of the polynomial $\left(x-1\right)$
Expand $\left(x-2\right)^2$
Multiply the single term $3$ by each term of the polynomial $\left(x^2-4x+4\right)$
Add the values $12$ and $2$
Combining like terms $-12x$ and $-2x$
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