Question 18735
Real roots implies that the value of the root will be greater than or equal to zero.
ie. say the root is x,then x>=0
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As per the question,one of the three roots is -2/3
if all three roots are real,then (-2/3) cannot be one of the roots.
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Please check your question and post again.
-Prabhat

[Edit: The three roots (whether real or not) can be found by equating p(x) to zero and then solving the trinomial ]