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x^{6}-x+3
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x^{6}-x+3
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x^{6}+256x-320-257x+323
Use the distributive property to multiply x^{2}+2x-4 by x^{4}-2x^{3}+8x^{2}-24x+80 and combine like terms.
x^{6}-x-320+323
Combine 256x and -257x to get -x.
x^{6}-x+3
Add -320 and 323 to get 3.
x^{6}+256x-320-257x+323
Use the distributive property to multiply x^{2}+2x-4 by x^{4}-2x^{3}+8x^{2}-24x+80 and combine like terms.
x^{6}-x-320+323
Combine 256x and -257x to get -x.
x^{6}-x+3
Add -320 and 323 to get 3.
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