u^2-8u-1280=0 middle term factor
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u^2-8u-1280=0
u^2-40u+32u-1280=0
u(u-40)+32(u-40)
(u+32)(u-40)
u^2-40u+32u-1280=0
u(u-40)+32(u-40)
(u+32)(u-40)
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