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x^{2}-2x+1+a^{2}-2a\left(x-1\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x-1\right)^{2}.
x^{2}-2x+1+a^{2}-2ax+2a
Use the distributive property to multiply -2a by x-1.
x^{2}-2x+1+a^{2}-2a\left(x-1\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x-1\right)^{2}.
x^{2}-2x+1+a^{2}-2ax+2a
Use the distributive property to multiply -2a by x-1.