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

x=2z=-1 A table is three times as long as it is wide. If it were 3 ft shorter and 3 ft wider, it would be square (with all sides equal). How long and how wide is the table?