Find the equation f(x) = a(x - h)2 + k for a parabola containing point (3, 6) and having (1, -2) as a vertex. what is the standard form of the equation? a) the vertex form is f(x) = 2(x - 1)2 − 2. the standard form is f(x) = 2x2−4x. b) the vertex form is f(x) = 2(x + 1)2 + 2. the standard form is f(x) = −2x2−4x. c) the vertex form is f(x) = −2(x - 7)2− 2. the standard form is f(x) = 2x2 + 4x. d) the vertex form is f(x) = −2(x - 1)2 − 2. the standard form is f(x) = 2x2 +4 x.