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a.
because if we put x= -6 the function approaches infinity

divide x in numerator and denominator.
then because x->infinity, 12/x->0
so u are left with 3/2 only

So in short we have to the function undefined?

ya right
i guess m wrong :p

Sorry, don't get you.. @hartnn

dividing x in numerator and denominator , we get (3+12/x)/(2-12/x)
agreed ?

Yes.

now when X gets infinitely larger 12/x and -12/x gets infinitely smaller.
agreed ?

I think, yes..

opposite

so to find what f(x) approaches, we put 12/x =0 and -12/x =0
then we get only 3/2.
ok ?

Nope. Don't get this step.

i see.. thanks.

welcome :)