exam Maths Puzzle Numerical Ability

x+3
over
x squared -4

How would I factor that, or if I am not supposed to factor how am I suppposed to find the domain?

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exam Other Question

If we could make a list of all the prime numbers, what number
would be at the end of the list? Because there are an infinite number of prime numbers,
there is no �largest prime n Find the center and radius by completing the square.
x^2+y^2+10x+7=0