pre calculus
posted by anon .
given the following rational function
a. state the domain
b. find the vertical and horizontal asymptotes if any
c. find the oblique asymptote
f(x) = x^2 + 7x + 5 / x + 8

as usual, the domain is all reals except where the denominator is zero. That is, all reals except x = 8
Vertical asymptotes occur when the denominator is zero and the numerator is not.
at x = 8, the numerator is not zero, so that's the vertical asymptote.
For large x, f(x) is just x^2/x = x, so there's an oblique asymptote at the line y=x, and here are no horizontal asymptotes.
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