exam Maths Puzzle Numerical Ability

Can I have some help finding the inverse function of f.
f(x)=1/(-10 x^2 + 6),text( )x>=0

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exam Other Question

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 :( Graph the following:

y is greater or equal to 3x-2

Thank you for any help you can provide me with.