How do you find the Vertical Horizontal and Oblique Asymptote given H(x)= (x^3-8) / (x^2-5x+6)?

Vertical: x=3; no Horizontal asymptote; Oblique: y=x+5
1) The vertical depend on the ; the domain is obtained by solving the following:
##x^2-5x+6!=0##
that is solved by :
##x=(-b+-sqrt(b^2-4ac))/2a##
where a=1; b=-5; c=6
then
##x=(5+-sqrt(5^2-4*1*6))/(2*1)##
##=(5+-sqrt(25-24))/2##
##=(5+-1)/2##
##x_1=2;x_2=3##
The domain of the given function is:
##x!=2 and x!=3##
Now let’s calculate
##lim_(x->2) (x^3-8)/(x^2-5x+6)=lim_(x->2)((cancel(x-2))(x^2+2x+4))/((cancel(x-2))(x-3))=-12##
and
##lim_(x->3) (x^3-8)/(x^2-5x+6) =lim_(x->3)((cancel(x-2))(x^2+2x+4))/((cancel(x-2))(x-3))=oo##
Then the vertical asymptote is the line x=3
2) Let’s calculate
##lim_(x->oo) (x^3-8)/(x^2-5x+6)=oo##
then there are no horizontal asymptote
3) Let’s calculate
##m=lim_(x->oo) (x^3-8)/(x^2-5x+6)*1/x=(x^3-8)/(x^3-5x^2+6x)=1##
that’s the slope of the oblique asymptote.
Let’s calculate the intercept
##n=lim_(x->oo) (x^3-8)/(x^2-5x+6)-mx=lim_(x->oo) (x^3-8)/(x^2-5x+6)-x##
##n=lim_(x->oo) (cancelx^3-8-cancelx^3+5x^2-6x)/(x^2-5x+6)=5##
Then the oblique asymptote is the line
##y=x+5##
graph{(x^3-8)/(x^2-5x+6) [-20 10 -15 5]}