Answer:
(d) zeros: -7, -8; opens upward
Explanation:
The sign of the leading coefficient tells you which way the graph opens.
There are numerous ways to tell the signs of the zeros. One of them is to consider Descarte's rule of signs.
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When the leading coefficient is positive, the graph opens upward. (Larger values of x make more positive values of y.)
This equation has + signs on every term, so there are zero sign changes. That means there are zero positive real roots. Both roots of the equation must be negative.
The zeros are -7 and -8, and the graph opens upward.