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x^{2}+10x+25+\left(y-4\right)^{2}-16
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+5\right)^{2}.
x^{2}+10x+25+y^{2}-8y+16-16
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(y-4\right)^{2}.
x^{2}+10x+41+y^{2}-8y-16
Add 25 and 16 to get 41.
x^{2}+10x+25+y^{2}-8y
Subtract 16 from 41 to get 25.
x^{2}+10x+25+\left(y-4\right)^{2}-16
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+5\right)^{2}.
x^{2}+10x+25+y^{2}-8y+16-16
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(y-4\right)^{2}.
x^{2}+10x+41+y^{2}-8y-16
Add 25 and 16 to get 41.
x^{2}+10x+25+y^{2}-8y
Subtract 16 from 41 to get 25.