I will assume that you mean
(x^2+4x-24)/(x-3)
Where you put parentheses makes all the difference.
x-3 is not a factor of (x^2+4x-24), so it is not possible to simplify the expression.
It is not clear just what the question is. All you have done is write a formula.
x^2+4x-24/x-3
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