Question 1181603
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The polynomial is degree 4 with positive leading coefficient, so the value goes to infinity for both large negative and large positive values.<br>
The zeros of the function are all single; from left to right they are -b, 0, c, and a.  So the function value is<br>
(1) greater than 0 on (-infinity,-b)
(2) less than or equal to 0 on [-b,0]
(3) greater than 0 on (0,c)
(4) less than or equal to 0 on [c,a]
(5) greater than 0 on (a,infinity)<br>
ANSWER: c. [-b,0] and [c,a]<br>