Answer
C
Work Step by Step
a = -1, b=-6, c=0. The equation has a negative coefficient so it opens downward.
To find the axis of symmetry, use the formula -b/2a. plug your a and b values into this equation to get the answer -3. Answer choice C is the only one of the answer choices with the axis of symmetry x=-3 and open downward. Therefore, the answer is C.