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x^{2}-8x+16-9\left(x-4\right)-10
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x-4\right)^{2}.
x^{2}-8x+16-9x+36-10
Use the distributive property to multiply -9 by x-4.
x^{2}-17x+16+36-10
Combine -8x and -9x to get -17x.
x^{2}-17x+52-10
Add 16 and 36 to get 52.
x^{2}-17x+42
Subtract 10 from 52 to get 42.
x^{2}-8x+16-9\left(x-4\right)-10
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x-4\right)^{2}.
x^{2}-8x+16-9x+36-10
Use the distributive property to multiply -9 by x-4.
x^{2}-17x+16+36-10
Combine -8x and -9x to get -17x.
x^{2}-17x+52-10
Add 16 and 36 to get 52.
x^{2}-17x+42
Subtract 10 from 52 to get 42.