precalc

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I am stuck on this one problem and think it might be the teachers typo but don't want to point it out without being sure. You have to find the zeros (we use long division) of x^5+8x^3+16x but because these are all raised to odd powers they either give me negative or positive numbers, regardless of the rational root I plug in..

Maybe I'm just being clueless..thank you tho!

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