medium · SAT Math
A quadratic function f is defined by f(x) = a(x - h)^2 + k, where a, h, and k are constants. The graph of y = f(x) in the xy-plane has a vertex at (4, -2) and passes through the point (2, 6).
What is the value of a?
- -4
- -2
- 1.5
- 2
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