Check each of these 12 candidates by plugging the values into the polynomial. You see that only evaluates to 0.

If you have a graphing utility, you can reduce the checking:

Here is the graph again after zooming in on the root:

The only candidate left is . Since , *x*=-2/3 is indeed a rational zero.

The only rational zero is .

Do you need more help? Please post your question on our S.O.S. Mathematics CyberBoard.

Tue Jun 24 12:43:57 MDT 1997

Contact us

Math Medics, LLC. - P.O. Box 12395 - El Paso TX 79913 - USA

users online during the last hour