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x^{2}-4x+4-\left(x^{2}-4x+4\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}+4x-4
To find the opposite of x^{2}-4x+4, find the opposite of each term.
-4x+4+4x-4
Combine x^{2} and -x^{2} to get 0.
4-4
Combine -4x and 4x to get 0.
0
Subtract 4 from 4 to get 0.
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