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How to factor out a polynomial

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I have a polynomial x^4 - 16x^2 + 40x - 25.

I need to know the technique in how to factor it out. Not just the answer.

For example, this answer: (x +5)*(x -1)*(x^2 -4*x +5)

What steps do I need to take to get to that? Or any other factored out answer?

Thank you for your time.

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Solution Summary

The technique to factor out polynomials is determined. A complete, neat and step-by-step solution is provided . Division is provided in the attached file.

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Please see the attached file for the division.
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x^4 - 16x^2 + 40x - 25 can ...

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