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x^{2}-6x+9=4^{2}+\left(x-5\right)^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x-3\right)^{2}.
x^{2}-6x+9=16+\left(x-5\right)^{2}
Calculate 4 to the power of 2 and get 16.
x^{2}-6x+9=16+x^{2}-10x+25
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x-5\right)^{2}.
x^{2}-6x+9=41+x^{2}-10x
Add 16 and 25 to get 41.
x^{2}-6x+9-x^{2}=41-10x
Subtract x^{2} from both sides.
-6x+9=41-10x
Combine x^{2} and -x^{2} to get 0.
-6x+9+10x=41
Add 10x to both sides.
4x+9=41
Combine -6x and 10x to get 4x.
4x=41-9
Subtract 9 from both sides.
4x=32
Subtract 9 from 41 to get 32.
x=\frac{32}{4}
Divide both sides by 4.
x=8
Divide 32 by 4 to get 8.