Following is a statement of a theorem which can be proven using the quadratic formula. For this theorem, a, b, and c are real numbers. Theorem - If f is a quadratic function of the form f(x) = ax2 + bx + c and ac < 0,then the function f has two x-intercepts. Using only this theorem, what can be concluded about the functions given by the following formulas?(a) g(x) = -8x2 + 5x - 2(b) h(x) = (-1/3)x2 + 3x(c) k(x) = 8x2 - 5x - 7