If f(x) = -2x2 + 8x - 4, which of the follwoing is true?  Choose the correct answer:
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.
E) The maximum value of f(x) is 4.
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 f is not a one to one function.   correct answer f is not a one to one function.
<result>D</result>
If f(x) = -2x2 + 8x - 4, which of the follwoing is true?