find all zeros - Math Help Forum

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#1

$Old$ October 25th, 2007, 10:39 AM

harry $harry is offline$

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Solve the following equation
9x^5-3x^4-31x^3-13x^2-20x-4=0.

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#2

$Old$ October 25th, 2007, 10:54 AM

ppyvabw $ppyvabw is offline$

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That looks like fun.

I would start by guessing one of the solutions and using the factor theorem. Then long divide by that factor to get a quartic. Write the quartic is a quadratic in y by setting y=x^2. Find the solutions of that, and then the values of x corrresponding to the y's

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