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Z=x^{2}-8x+16-\left(x-2\right)\left(x-8\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x-4\right)^{2}.
Z=x^{2}-8x+16-\left(x^{2}-10x+16\right)
Use the distributive property to multiply x-2 by x-8 and combine like terms.
Z=x^{2}-8x+16-x^{2}+10x-16
To find the opposite of x^{2}-10x+16, find the opposite of each term.
Z=-8x+16+10x-16
Combine x^{2} and -x^{2} to get 0.
Z=2x+16-16
Combine -8x and 10x to get 2x.
Z=2x
Subtract 16 from 16 to get 0.
Z=x^{2}-8x+16-\left(x-2\right)\left(x-8\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x-4\right)^{2}.
Z=x^{2}-8x+16-\left(x^{2}-10x+16\right)
Use the distributive property to multiply x-2 by x-8 and combine like terms.
Z=x^{2}-8x+16-x^{2}+10x-16
To find the opposite of x^{2}-10x+16, find the opposite of each term.
Z=-8x+16+10x-16
Combine x^{2} and -x^{2} to get 0.
Z=2x+16-16
Combine -8x and 10x to get 2x.
Z=2x
Subtract 16 from 16 to get 0.
2x=Z
Swap sides so that all variable terms are on the left hand side.
\frac{2x}{2}=\frac{Z}{2}
Divide both sides by 2.
x=\frac{Z}{2}
Dividing by 2 undoes the multiplication by 2.