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\(x^6+2x^5+x^4-2x^3-2x^2+1=\left(x^3+x^2-1\right)^2\)
x4-2x3+2x-1
=(x4-1)+(-2x3+2x)
=(x2+1)(x2-1)-2x(x2-1)
=(x2-1)(x2+1-2x)
=(x-1)(x+1)(x-1)2
=(x-1)3(x+1)
a) \(=\left(x^2-6\right)\left(x^2-1\right)=\left(x^2-6\right)\left(x-1\right)\left(x+1\right)\)
b) \(=\left(x^2-1\right)\left(x^2+3\right)=\left(x-1\right)\left(x+1\right)\left(x^2+3\right)\)
c) \(=x^2\left(x-1\right)-x\left(x-1\right)+4\left(x-1\right)=\left(x-1\right)\left(x^2-x+4\right)\)
\(x^6-x^4+2x^3+2x^2\)
\(=x^2\left(x^4-x^2+2x+2\right)\)
\(=x^2\left[x^4-2x^3+x^2+2x^3-4x^2+2x+2x^2-4x+2\right]\)
\(=x^2\left[x^2\left(x^2-2x+1\right)+2x\left(x^2-2x+1\right)+2\left(x^2-2x+1\right)\right]\)
\(=x^2\left(x^2-2x+1\right)\left(x^2+2x+2\right)\)
\(=x^2\left(x-1\right)^2\left(x^2+2x+2\right)\)
\(x^6-x^4+2x^3+2x^2\)
\(=x^4.\left(x^2-1\right)+2x^2.\left(x+1\right)\)
\(=x^4.\left(x-1\right).\left(x+1\right)+2x^2.\left(x+1\right)\)
\(=\left(x+1\right).\left(x^5-x^4+2x^2\right)\)