What is the vertex form, f(x) = a(x − h)2 + k, for a parabola that passes through the point (4, −3) and has (5, 2) as its vertex. what is the standard form of the equation? a) vertex form: f(x) = 5(x + 5)2 + 2 standard form: f(x) = 5x2 + 50x − 123 b) vertex form: f(x) = 5(x − 5)2 + 3 standard form: f(x) = 5x2 + 50x − 123 c) vertex form: f(x) = −5(x − 5)2 + 2 standard form: f(x) = −5x2 + 50x − 123 d) vertex form: f(x) = −5(x − 5)2 − 3 standard form: f(x) = −5x2 + 50x − 148