exam Maths Puzzle Numerical Ability

What is the transformational form of y= -1/3x^2+3x-1 ?
I got -3(y+23/4) =(x+9/2)^2 It was marked wrong :(

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exam Other Question

How do you simplify. It is under Problem Set 4.1 number 47. ok im completely lost! were talking about angle side angle, angle angle side, and so on..well i get confused about the prof part. can you please help me!!!