book Maths Puzzle Numerical Ability

please give the range and domain of this function
f(x)=1/{sqrt(x^2-4)}

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book Other Question

8x^+16x=24 Perform the indicated operations. Simplify the result.

(x^2 - 5x - 14/x^2 - 6x - 7) * (x^2 - 4x -5) / (x^2 + x - 30/2)