Mrs. Robinson bought a novel at a bookstore on sale for 20% off its regular price of $29.99. Mr. Chang bought the same novel at
2 answers:
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Given:
A parabola opens up or down and its vertex is at the point (h, v).
To find:
The equation of the parabola.
Solution:
A parabola opens up or down. It means it is a vertical parabola.
The vertex form of a vertical parabola is
...(i)
Where, a is constant and (h,k) is vertex.
The vertex of given parabola is at point (h,v). Putting h=h and k=v in (i), we get
The required equation of the parabola is .
Therefore, the correct option is A.