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x^{2}-12x+36=\left(x+2\right)^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x-6\right)^{2}.
x^{2}-12x+36=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}-12x+36-x^{2}=4x+4
Subtract x^{2} from both sides.
-12x+36=4x+4
Combine x^{2} and -x^{2} to get 0.
-12x+36-4x=4
Subtract 4x from both sides.
-16x+36=4
Combine -12x and -4x to get -16x.
-16x=4-36
Subtract 36 from both sides.
-16x=-32
Subtract 36 from 4 to get -32.
x=\frac{-32}{-16}
Divide both sides by -16.
x=2
Divide -32 by -16 to get 2.