SOLUTION: Please help me to solve this Factorisation Factorisation of x^4-9x-20

Question 1161222: Please help me to solve this Factorisation
Factorisation of x^4-9x-20
Answer by ikleyn(52866) (Show Source): You can put this solution on YOUR website!
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x^4 - 9x - 20 = (x^2-x-4)*(x^2+x+5)

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Comment from student: Thank you so much for giving the answer . . . but can you please tell me how did you do that??
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My response : I will not conceal it from you . . .

I used a (free of charge) online calculator at WEB-site

https://www.mathportal.org/calculators/polynomials-solvers/polynomial-roots-calculator.php

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