What are the zeroes of the polynomial equation? f(x) = x^2+9x+20

asked Apr 18, 2017 159k views

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What are the zeroes of the polynomial equation?

f(x) = x^2+9x+20

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

Etham answered Apr 19, 2017

by Etham

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zeroes are when f(x)=0
0=x^2+9x+20
factor
0=(x+4)(x+5)
set each to zero
x+4=0
x=-4
x+5=0
x=-5

zeroes are f(-5) and f(-4)

Joao Paulo answered Apr 22, 2017

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