exam Maths Puzzle Numerical Ability

Find the domain and the range after graphing: y= x2 - 1

I am not understanding the process in which you find the domain and the range.

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Pls answer it imeediately because i need the answer as soon as possible, Thanks alot!...Q: A circular patch is to be placed over a 3" hole in a sheet of metal so that the patch extends 3/4" all around. The diameter of the patch will be??? . If 1/3 is subtracted from 3 times the reciprocal of a certain number, the result is 25/6. Find the number.