which of the following are roots of the following polynomial f(x)=x3-5x2-13x-7

which of the following are roots of the following polynomial f(x)=x3-5x2-13x-7

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HI!!

math teachers usually make this easy
1 does not work because \[f(1)=1-5-13-7\neq 0\]

the next good guess is to try \[f(-1)=-1+5+13-7\]

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