I have to find out if the asymptotes of the following asymphtotes exist or not. And if they do exist I have to find out which type and the equation.

f(x) = (x^2-4)(x+3) / x^2-1

x =/ (cannot be) -1,1

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f(x) = 3x^2+4x-2 / x^2-9

x =/ (cannot be) +- 3

Hope I can get some help I´m really strugling here..