1: \(A=\left(x-6\right)\left(x+1\right)\)
2: \(=2x^2-5x+4x-10=\left(2x-5\right)\left(x+2\right)\)
3: \(=-\left(2x^2-3x+1\right)=-\left(2x-1\right)\left(x-1\right)\)
7: \(=x^2-5x+x-5=\left(x-5\right)\left(x+1\right)\)
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