book Maths Puzzle Numerical Ability

Find the domain of the function h given by
h(x)= 2x=3
_____
x^2-9

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book Other Question

Whats the fraction of 500 and 2400 what will that answer equual to
Foe e.g i think it is 500/2400 but is that right? I am not sure what to do.

(a) What is the sum of the roots of the equation ax squared + bX + c = 0
(b) What is the product of its roots?