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x^{2}-4x+4=x\left(x-2\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x-2\right)^{2}.
x^{2}-4x+4=x^{2}-2x
Use the distributive property to multiply x by x-2.
x^{2}-4x+4-x^{2}=-2x
Subtract x^{2} from both sides.
-4x+4=-2x
Combine x^{2} and -x^{2} to get 0.
-4x+4+2x=0
Add 2x to both sides.
-2x+4=0
Combine -4x and 2x to get -2x.
-2x=-4
Subtract 4 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-4}{-2}
Divide both sides by -2.
x=2
Divide -4 by -2 to get 2.