Question 308831
a.


t(z)=(z^2-z-6)/(z^2+z-12)


t(z)=((z-3)(z+2))/((z-3)(z+4))



t(z)=(z+2)/(z+4)


removable discont at z=3


b.


discont at z=-4 since z+4 is denominator


c.


Domain: set of all real numbers but z =/= 3 or z =/= -4