FIND HORIZONTAL AND VERTICAL ASYMPTOTOES

Vertical Asymptote :

The vertical line x = a is called a vertical asymptote of the graph of y = f(x) if

How to find vertical asymptote ?

The graph of y = f(x) will have vertical asymptotes at those values of x for which the denominator is equal to zero.

Horizontal Asymptote :

The horizontal line y  =  b is called a horizontal asymptote of the graph of y  =  f(x) if either The graph of y = f(x) will have at most one horizontal asymptote. It is found according to the following:

How to find vertical and horizontal asymptotes of rational function ?

1) If

degree of numerator > degree of denominator

then the graph of y = f(x) will have no horizontal asymptote.

2) If

degree of numerator  =  degree of denominator

then the graph of y = f(x) will have a  horizontal asymptote at y  =  an/bm.

3)  If

degree of numerator < degree of denominator

then the graph of y = f(x) will have a horizontal asymptote at y = 0 (i.e., the x-axis).

  • A graph can have an infinite number of vertical asymptotes, but it can only have at most two horizontal asymptotes.
  • Horizontal asymptotes describe the left and right-hand behavior of the graph.
  • A graph will (almost) never touch a vertical asymptote; however, a graph may cross a horizontal asymptote.

Find the vertical and horizontal asymptotes of the function given below.

Example 1 :

f(x)  =  4x2/(x+ 8)

Solution :

Vertical Asymptote :

x+ 8  =  0

x2  =  -8

x  =  √-8

Since  √-8 is not a real number, the graph will have no vertical asymptotes.

Horizontal Asymptote :

The highest exponent of numerator and denominator are equal.

Vertical asymptote  y  =  4/1.

So, horizontal asymptote is y  =  4

Example 2 :

f(x)  =  (4x+5)/(4x2-9)

Solution :

Vertical Asymptote :

4x2-9  =  0

4x2  =  9

x  =  √(9/4)

x  =  ± 3/2

So, vertical asymptotes are x  =  3/2 and x  =  -3/2.

Horizontal Asymptote :

Degree of the denominator > Degree of the numerator

So, the  horizontal asymptote is y = 0.

Example 3 :

f(x)  =  (x3+2x+1)/(x2-x-12)

Solution :

Vertical Asymptote :

x2-x-12  =  0

(x-4)(x+3)  =  0

x  =  4 and -3

So, vertical asymptotes are x  =  4 and x  =  -3.

Horizontal Asymptote :

Degree of the numerator  =  3

Degree of the denominator  =  2

Degree of the numerator > Degree of the denominator

It has no horizontal asymptote.

Example 4 :

f(x)  =  (4x2-3)/(2x2-3x+1)

Solution :

Vertical Asymptote :

2x2-3x+1  =  0

(2x-1)(x-1)  =  0

x  =  1/2 and 1

So, vertical asymptotes are x  =  1/2 and x  =  1.

Horizontal Asymptote :

Degree of the numerator  =  2

Degree of the denominator  =  2

Degree of the numerator = Degree of the denominator

Horizontal asymptote  =  4/2  ==>  2

So, the horizontal asymptote is y = 2.

Example 5 :

Find the asymptote of the function 

f(x)  =  ln(2x+3)

Solution :

Vertical Asymptote :

2x+3  =  0

2x  =  -3

x  =  -3/2

So, vertical asymptote is x  =  -3/2.

Apart from the stuff given above, if you need any other stuff in math, please use our google custom search here.

Kindly mail your feedback to v4formath@gmail.com

We always appreciate your feedback.

©All rights reserved. onlinemath4all.com

Recent Articles

  1. Writing Numbers in Words Worksheet

    Jan 16, 22 11:56 PM

    Writing Numbers in Words Worksheet

    Read More

  2. Operations with Negative Numbers Worksheet

    Jan 16, 22 11:40 PM

    Operations with Negative Numbers Worksheet

    Read More

  3. Operations with Negative Numbers

    Jan 16, 22 11:23 PM

    Operations with Negative Numbers

    Read More