Question 1077099
<pre>
A potential zero is any positive or negative fraction 
whose numerator is a factor of 8 (the last term), and whose
denominator is a factor of 3 the leading coefficient.

So the potential zeros are positive or negative fractions 
with numerator 1,2,4, or 8 and denominator 1 or 3.

They are ±1,±1/3,±2,±2/3,±4,±4/3,±8,±8/3 

Try -2/3  and synthetic division.

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Edwin</pre>