Question 1161222
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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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<U>My response</U> :  &nbsp;&nbsp;I will not conceal it from you . . . 


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


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