exam Maths Puzzle Numerical Ability

I do not know if my question belongs in this category. But it deals with inverse functions.

The function is f(x) =

1
----------------------
x^3 + 12x^2 + 48x + 4

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exam Other Question
the sum of a two digit number is 10. if 18 be subtracted from it, the digits in the resulting number will be equal. the number is??? Solve the following systems by substitution


4x- 12y= 5
-x +3y=-1