In the quadratic equation above, n is a nonzero constant. The graph of the equation in the xy-plane is a parabola with vertex (f, g). Which of the following is equal to g?
Options
A
-25n
B
-21n
C
4n
D
10n
Answer & Analysis
Answer
A
Analysis
First, set the y-value to 0, so we have:
Therefore, we have solutions x =7 and x = -3.
The vertex of the parabola will be located directly in the middle of them. So, the midpoint is:
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