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

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Question 1161222: Please help me to solve this Factorisation
Factorisation of x^4-9x-20
Answer by ikleyn(52858) About Me  (Show Source):
You can put this solution on YOUR website!
.

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