book Maths Puzzle Numerical Ability

What is the domain of:

f(x) = x/xsquared + 3x - 4

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book Other Question

Which of the following expressions represents the product of 3 les than twice x and 2 more than the quantity 3 times x? X2 + y2 = 25 where Y =3

what is the answer? Please Please Please and how did you arrive at it.

9
5
16
4
Thank you so very much inadvance.
trica.