# Often asked: How many horizontal asymptotes can a function have?

A function can have at most two different horizontal asymptotes. A graph can approach a horizontal asymptote in many different ways; see Figure 8 in §1.6 of the text for graphical illustrations. In particular, a graph can, and often does, cross a horizontal asymptote.

What is the best way to find horizontal asymptotes?

• The horizontal asymptote of a rational function can be determined by looking at the degrees of the numerator and denominator. Degree of numerator is less than degree of denominator: horizontal asymptote at y = 0. Degree of numerator is greater than degree of denominator by one: no horizontal asymptote; slant asymptote.

## How many horizontal asymptotes can there be?

Therefore, to find horizontal asymptotes, we simply evaluate the limit of the function as it approaches infinity, and again as it approaches negative infinity. A function can have at most two horizontal asymptotes , one in each direction.

## Can you have 3 horizontal asymptotes?

A rational function can have at most one horizontal or oblique asymptote , and many possible vertical asymptotes ; these can be calculated.

## How many times can a function cross a horizontal asymptote?

increases without bound or decreases without bound. sufficiently large. approaches is called a horizontal asymptote . crosses its horizontal asymptote y=0 infinitely many times .

## Can a function have more than 2 horizontal asymptotes?

A function can have at most two different horizontal asymptotes . A graph can approach a horizontal asymptote in many different ways; see Figure 8 in §1.6 of the text for graphical illustrations. In particular, a graph can , and often does , cross a horizontal asymptote .

## What is the horizontal asymptote?

Horizontal asymptotes are horizontal lines the graph approaches. Horizontal Asymptotes CAN be crossed. If the degree (the largest exponent) of the denominator is bigger than the degree of the numerator, the horizontal asymptote is the x-axis (y = 0).

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## Can a rational function have both slants and horizontal asymptotes?

the rational function will have a slant asymptote . Some things to note: The slant asymptote is the quotient part of the answer you get when you divide the numerator by the denominator. A graph can have both a vertical and a slant asymptote , but it CANNOT have both a horizontal and slant asymptote .

## Can a graph intersect a horizontal asymptote?

NOTE: A common mistake that students make is to think that a graph cannot cross a slant or horizontal asymptote . This is not the case! A graph CAN cross slant and horizontal asymptotes (sometimes more than once). It’s those vertical asymptote critters that a graph cannot cross .

## Can a rational function have a horizontal asymptote?

Finding Horizontal Asymptote A given rational function will either have only one horizontal asymptote or no horizontal asymptote . Case 1: If the degree of the numerator of f(x) is less than the degree of the denominator, i.e. f(x) is a proper rational function , the x-axis (y = 0) will be the horizontal asymptote .

## How do you find the rule for horizontal asymptotes?

The three rules that horizontal asymptotes follow are based on the degree of the numerator, n, and the degree of the denominator, m. If n < m, the horizontal asymptote is y = 0. If n = m, the horizontal asymptote is y = a/b. If n > m, there is no horizontal asymptote .

## What is the equation of the horizontal asymptote?

Another way of finding a horizontal asymptote of a rational function: Divide N(x) by D(x). If the quotient is constant, then y = this constant is the equation of a horizontal asymptote .

## Do square root functions have horizontal asymptotes?

A quadratic has no asymptotes because it is a 2nd degree polynomial. It’s pretty easy to see that a function has an asymptote if and only if its inverse also has one, because the asymptote will also get flipped through . So, that’s one explanation of why square root functions have no asymptote .