How do you prove a horizontal asymptote?

The horizontal asymptote of a rational function can be determined by looking at the degrees of the numerator and denominator.

1. Degree of numerator is less than degree of denominator: horizontal asymptote at y = 0.
2. Degree of numerator is greater than degree of denominator by one: no horizontal asymptote; slant asymptote.

How do you justify horizontal asymptotes with limits?

Horizontal Asymptotes A function f(x) will have the horizontal asymptote y=L if either limx→∞f(x)=L or limx→−∞f(x)=L. Therefore, to find horizontal asymptotes, we simply evaluate the limit of the function as it approaches infinity, and again as it approaches negative infinity.

How do you tell if a graph has an asymptote?

The line x=a is a vertical asymptote if the graph increases or decreases without bound on one or both sides of the line as x moves in closer and closer to x=a . The line y=b is a horizontal asymptote if the graph approaches y=b as x increases or decreases without bound.

How do you tell if there are vertical asymptotes?

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.

What does an asymptote look like?

An asymptote is a line that a graph approaches without touching. Similarly, horizontal asymptotes occur because y can come close to a value, but can never equal that value. Thus, f (x) = has a horizontal asymptote at y = 0.

How do you find vertical asymptotes step by step?

Steps to Find Vertical Asymptotes of a Rational Function

1. Step 1 : Let f(x) be the given rational function. Make the denominator equal to zero.
2. Step 2 : When we make the denominator equal to zero, suppose we get x = a and x = b.
3. Step 3 : The equations of the vertical asymptotes are. x = a and x = b.