vertex= (1,-1) and the other given point is (3,7)
If the vertex is at (1,-) then we have a parabola whose basic form must be
y = A(x-1)^2 - 1
Since the other point is (3,7), then we can find A by plugging in the values
7 = A(3-1)^2 - 1
7 = A(2)^2 - 1
7 = 4A - 1
4A = 8
A = 2
So, the final quadratic function is f(x) = 2(x-1)^2 - 1
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