If f(x) = -2x2 + 8x - 4, which of the follwoing is true? A. The maximum value of f(x) is - 4. B. The graph of f opens upward. C. The graph of f has no x-intercept D. f is not a one to one function.
f(x) is a quadratic function and its graph is a parabola that may be intercepted by horizontal lines at two points and therefore is not a one to one function. The answer is D
