Michael J. answered 12/10/17
Tutor
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Effective High School STEM Tutor & CUNY Math Peer Leader
Use synthetic division to find the quadratic factor.
3 | -6 19 0 -9
-18 3 9
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-6 1 3 0
Quadratic factor is (-6x2 + x + 3)
You can rewrite this so that the leading coefficient is positive.
-(6x2 - x - 3)
Now you can find the two other zeros.