.25_ For each matrix K, vector f, and scalar c, write out the quadratic function p(x) given by Kx^2 + fx + c. Then, either find the minimizer x and minimum value p(x), or explain why there is none.
(a) K = -4, f = (#), c = 3;
(b) K = 0, f = (#), c = 0;
(c) K = -1, f = (#), c = 9;
(d) K = (i), f = (#), c = 1;
(e) K = 9v-(4).