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x^{2}-6x+9+\left(y-4\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+y^{2}-8y+16
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(y-4\right)^{2}.
x^{2}-6x+25+y^{2}-8y
Add 9 and 16 to get 25.
x^{2}-6x+9+\left(y-4\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+y^{2}-8y+16
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(y-4\right)^{2}.
x^{2}-6x+25+y^{2}-8y
Add 9 and 16 to get 25.