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extended list of possible rational...

Find all the zeros of the function. When there is an extended list of possible rational zeros, use a graphing utility to graph the function in order to disregard any of the possible rational zeros that are obviously not zeros of the function. (Enter your answers as a comma-separated list.)

f(x) = x3 + 19x2 + 129x + 315

x =

f(x) = x3 + 19x2 + 129x + 315

x =

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