5: \(x^2-9x+20=\left(x-5\right)\left(x-4\right)\)
7: \(x^2-x-20=\left(x-5\right)\left(x+4\right)\)
6: \(4x^2-12x+9=\left(2x-3\right)^2\)
8: \(2x^2-3x-2=\left(x-2\right)\left(2x+1\right)\)
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