What are the zeros of the polynomial function f(x)=x^3+9x^2+20x?

asked Mar 28, 2017 34.1k views

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$x^3+9x^2+20x=0\\ x(x^2+9x+20)=0\\ x(x^2+4x+5x+20)=0\\ x(x(x+4)+5(x+4))=0\\ x(x+5)(x+4)=0\\ x=0 \vee x=-5 \vee x=-4$

Knutwalker answered Apr 4, 2017

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