Table of Contents

## Will all rational functions have at least one vertical asymptote?

Not all rational functions will have at least one vertical asymptote. In order for there to be a vertical asyptote the denominater must equal zero.

## Is there always a vertical asymptote in a rational function?

Finding Vertical Asymptote(s) A rational function reduced to lowest terms (all factors common to both numerator and denominator cancelled out) will have a vertical asymptote at every value of x that would make the denominator equal zero. One function may have many vertical asymptotes.

**What makes a function have a vertical asymptote?**

Vertical asymptotes occur when a factor of the denominator of a rational expression does not cancel with a factor from the numerator. When you have a factor that does not cancel, instead of making a hole at that value, there exists a vertical asymptote. The vertical asymptote is represented by a dotted vertical line.

### Which function has no vertical asymptote?

Vertical asymptote of a rational function occurs when denominator is becoming zeroes. If a function like any polynomial y=x2+x+1 has no vertical asymptote at all because the denominator can never be zeroes.

### How many vertical asymptotes can a function have?

Vertical Asymptotes. So how many horizontal asymptotes can a function have? You may know the answer for vertical asymptotes; a function may have any number of vertical asymptotes: none, one, two, three, 42, 6 billion, or even an infinite number of them!

**Why would a function not have a vertical asymptote?**

If we set the denominator equal to zero and solve for x, we won’t get a real solution. Therefore, the graph does not have any vertical asymptotes.

## How do you find a horizontal asymptote in a rational function?

Identifying Horizontal Asymptotes and Slant Asymptotes of Rational Functions

- If N < D, then the horizontal asymptote is y = 0. For example, y=2x3x2+1.
- If N = D, then the horizontal asymptote is y = ratio of the leading coefficients. For example, y=2x23x2+1.
- If N > D, then there is no horizontal asymptote.

## How could you find the horizontal asymptote of a rational function?

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.

**How do you know if there is a vertical asymptote?**

Vertical asymptotes can be found by solving the equation n(x) = 0 where n(x) is the denominator of the function ( note: this only applies if the numerator t(x) is not zero for the same x value). Find the asymptotes for the function . The graph has a vertical asymptote with the equation x = 1.

### How do you tell if a rational function has no vertical asymptote?

### Can a function only have one horizontal asymptote?

A function can have at most two different horizontal asymptotes.

**Can a rational function have both a horizontal and vertical asymptote?**

A graph can have both a vertical and a slant asymptote, but it CANNOT have both a horizontal and slant asymptote.