Explanation:
Vertex is (5,7)
then the vertex form of the parabola is :
f(x) = y = a ( x-5)^2 + 7 sub in the point (6,4) to calculate 'a'
4 = a ( 6-5)^2 + 7
4 = a + 7
- 3 = a
f(x) = - 3(x-5)^2 + 7
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