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x^{2}-4x+4=\left(x+2\right)^{2}
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}+4x+4
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}=4x+4
Subtract x^{2} from both sides.
-4x+4=4x+4
Combine x^{2} and -x^{2} to get 0.
-4x+4-4x=4
Subtract 4x from both sides.
-8x+4=4
Combine -4x and -4x to get -8x.
-8x=4-4
Subtract 4 from both sides.
-8x=0
Subtract 4 from 4 to get 0.
x=0
Product of two numbers is equal to 0 if at least one of them is 0. Since -8 is not equal to 0, x must be equal to 0.