\(x^2-2009x+2008=x^2-x-2008x+2008=x\left(x-1\right)-2008\left(x-1\right)=\left(x-1\right)\left(x-2008\right)\)
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\(x^2-2009x+2008=x^2-x-2008x+2008=x\left(x-1\right)-2008\left(x-1\right)=\left(x-1\right)\left(x-2008\right)\)