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OpenStudy (anonymous):
Factor, x^3+3x^2-4x-20. I don't know how to pick a formula
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OpenStudy (anonymous):
You can't use a formula. You have to guess a root and use syntheic or long division. You can try the rational roots theorem to guess a root.
OpenStudy (anonymous):
I thought your suppose to use the a^2-b^2 ??
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