3 Here is the graph of a quadratic function f 10 IN 3 4 5 6 2 0 3 4 6 0 A f x x 2 x 4 4 4 5 15 7 Select the equation that defines the function f 3 f x x 4 x 6 c f x x 4 x 87 D f x x 2 x 6