a: \(2a^2-2ab+a-b\)
\(=\left(2a^2-2ab\right)+\left(a-b\right)\)
\(=2a\left(a-b\right)+\left(a-b\right)\)
\(=\left(a-b\right)\left(2a+1\right)\)
b: \(4x^4y^2-16x^3y^2+16x^2y^2\)
\(=4x^2y^2\cdot x^2-4x^2y^2\cdot4x+4x^2y^2\cdot4\)
\(=4x^2y^2\left(x^2-4x+4\right)\)
\(=4x^2y^2\left(x-2\right)^2\)
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