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3 Best Rules How to Find Horizontal Asymptotes?

Before examining the horizontal asymptote, you need to know what precisely an asymptote is. Horizontal asymptotes exist in the AP Calculus, AB, and BC tests. Thus, learning how to detect them graphically and analytically is crucial.

The word asymptote is a Greek word derived from Greek asymptotes, which means “not falling together.” In mathematics, it is a line or value that a graph of a curve approaches or gets closer and closer to but never meets at any infinite distance. There are three types of asymptotes: oblique, horizontal, and vertical, which are different. 

A horizontal asymptote of a rational function is a horizontal line on the graph which approaches the process but does not meet its infinite value. In other mathematical terms, a function will access a horizontal asymptote only if the input of the operation grows to infinity. The output of the process approaches a constant value. 

A rational function is an equation that lets you know how two things relate. It usually tells you how “y” and “x” are associated. A horizontal asymptote exists where the numerator and numerator are polynomials, called relational expressions. 

What Is The Degree Of Polynomial?

A polynomial is an expression that consists of variable series and coefficients related only to subtraction, addition, and multiplication operators. For example, axn+bym is the general form of a polynomial. Here a & b are coefficients, x & y are variables, and m & n are non-integers.

Further, you can determine the degree of a polynomial by adding its monomial terms together, equal to the highest degree of the polynomial’s monomial terms. So we can say that 3×2+2x-6 is a polynomial expression combining coefficients and negative integers. Similarly, 8×4-3×3+7y2 are also polynomials with separate variables.

For example, the polynomial 3z4x3-3y3z2+2xz-7 that you also can write that 3x4y3-3x3y2+2x1y1-7x0y0 has four terms. The first term has a degree of 7 (4+3), the second term has a degree of 5 (3+2), the third term has a degree of 2 (1+1), and the final term has a degree of 0 (0+0), so 7 is the monomial term having the highest degree, which is the degree of the entire polynomial. 

Horizontal Asymptotes Rules 

There are some rules to see the cases where a horizontal asymptote exists and how it behaves. The rules are of three types to find the horizontal asymptotes that determine only by looking at the numerator and denominator degrees. 

There are the following three standard rules of horizontal asymptotes.

  1. If the degree of the numerator (top) is less than the degree of the denominator (bottom), then the function has a horizontal asymptote at y=0. In the function f(x) = (x+4) / (x2-3x), the term of the bottom degree is greater than the term of the highest degree, so the function has a horizontal asymptote at y=0. 
  2. If the numerator degree is equal to the degree of the denominator, divide the coefficient of the highest degree terms. In the function f(x) = (8x²-6)/(2x²+3), then the degree of both polynomials is 2., it will give 8/2=4 and the function’s horizontal asymptote at y=4. 
  3. If the degree of the numerator is greater than the degree of the denominator, then the function does not have a horizontal asymptote. For example, f(x) = (2×2)/(x-5) does not have a horizontal asymptote as the degree of the top term is greater than the degree of the bottom. 

It is possible to find an oblique asymptote on a graph in circumstances when the degree of the numerator is exactly one greater than the degree of the denominator, which occurs in some cases. While graphing does not correctly prove that a function has a horizontal asymptote, it can help you find the right direction. As with things related to the process, graphing can help you determine the horizontal asymptote. 

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