exam Maths Puzzle Numerical Ability

y^3-13y^2+54y-72
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Y-6

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Alright my problem is this. It is a quadratic function with the arrows pointing upward. I have to figure out which equation goes with it. Here are the equations:
y=[[x]]-2, y=2|x|, y=2sq root of x, y= -3, y= .5x^2, y= - 3/x+1, or y= -3/x I am having a very hard time trying to figure this out. Can you please help me?

Find the axis of symmetry.

y = -x squared + 6x - 2