exam Maths Puzzle Numerical Ability

Choose values of x, then simplify it correctly.
10x^2-30x+20/x^2-1
I did something wrong on that one, maybe someone could show me how it works.

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exam Other Question
Is every monomial a term and every term a monomial? Support answer with reasons. Can I have some help finding the inverse function of f.
f(x)=1/(-10 x^2 + 6),text( )x>=0