exam Maths Puzzle Numerical Ability

find the domain of the function f(x)=1n(12x-48)

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exam Other Question

Express result in simplest form

5a - 12
Divided by
a^2 - 8a + 15

minus

3a - 2
Divided by
A^2 - 8a + 15 multiply then put in lowest terms....... i got this far now im not sure what to do?

2x+2/(x+4)(x-1) times (x+4)(x-2)/2x-4