Pre-Cal Zero's of a polynomial question?

Xlayer

New member
I already know the answer to this, but I was wondering if someone can explain the steps to get the answer...
I have to find all the zeros of f(x)= x^3+24x^2+214x+740 The answers are -10, -7+5i, -7-5i
Where does the -7+/- 5i come from?
 
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