What is the equation of the quadratic graph with a focus of (−4, − five fourths ) and a directrix of y = twenty seven fourths ? (1 point) f(x) = negative one sixteenths x2 − one half x + seven fourths f(x) = negative one sixteenths x2 − one half x + thirteen fourths f(x) = one sixteenths x2 + one half x + seven fourths f(x) = one sixteenths x2 + one half x + thirteen fourths