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I m currently studying some Integrals from a book which my elder brother studied with years ago, and one of the problems had the denominator:

x^3-7x+6

Well, I m sure that's over my level, and teacher will never ask this, but in the solution it says its roots are x=1, x=2 and x=-3, without showing the steps, or saying how he found them.

Wondering what the steps were, I typed the question at WolframAlpha, and it weirdly said step by step solution is unavailable.

Can somebody show me a formula or a way to find the roots in such a question?

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# Having problem with roots

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