skyswan skyswan

09-07-2016
Mathematics

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

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konrad509 konrad509

09-07-2016

[tex]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[/tex]

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