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use the given zero to find the remaining zeros of the function


zero: 5

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  • algebra -

    if 5 is a zero, then x-5 is a factor
    So use either synthetic or long algebraic division to show that

    x^4-15x^3+60x^2+70x-816 = (x-5)(....)

    Hey, I just tried that and 5 is not a zero of your function, that is, x-5 does not divide evenly.

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