\(a.x^3-3x^2+1-3x\)
\(=\left(x^3+1\right)-\left(3x^2+3x\right)\)
\(=\left(x+1\right)\left(x^2-x+1\right)-3x\left(x+1\right)\)
\(=\left(x+1\right)\left(x^2-4x+1\right)\)
\(c.3x^2-7x-10\)
\(=3x^2+3x-10x-10\)
\(=3x\left(x+1\right)-10\left(x+1\right)\)
\(=\left(x+1\right)\left(3x-10\right)\)
\(d.x^4+1-2x^2\)
\(=\left(x^2\right)^2-2.x^2.1+1\)
\(=\left(x^2-1\right)^2\)
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\(e.x^2-3x+2\)
\(=\left(x-2\right)\left(x-1\right)\)
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