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9x^{2}-60x+100=\left(3x-8\right)^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(3x-10\right)^{2}.
9x^{2}-60x+100=9x^{2}-48x+64
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(3x-8\right)^{2}.
9x^{2}-60x+100-9x^{2}=-48x+64
Subtract 9x^{2} from both sides.
-60x+100=-48x+64
Combine 9x^{2} and -9x^{2} to get 0.
-60x+100+48x=64
Add 48x to both sides.
-12x+100=64
Combine -60x and 48x to get -12x.
-12x=64-100
Subtract 100 from both sides.
-12x=-36
Subtract 100 from 64 to get -36.
x=\frac{-36}{-12}
Divide both sides by -12.
x=3
Divide -36 by -12 to get 3.