## Horizontal asymptotes

### Horizontal asymptotes are imaginary lines that a graph approaches in the horizontal direction as the input values (usually x-values) become infinitely large or infinitely small

Horizontal asymptotes are imaginary lines that a graph approaches in the horizontal direction as the input values (usually x-values) become infinitely large or infinitely small. They signify the long-term behavior of a function as x approaches positive or negative infinity.

For a function f(x) as x approaches positive infinity, a horizontal asymptote can have one of three possibilities:

1. The function approaches a specific value, denoted as y = L. In this case, the function gets arbitrarily close to the value L as x gets larger and larger.

2. The function approaches positive infinity, denoted as y = +∞. This occurs when the function grows without bound as x becomes infinitely large.

3. The function approaches negative infinity, denoted as y = -∞. This occurs when the function decreases without bound as x becomes infinitely large.

Similarly, as x approaches negative infinity, a horizontal asymptote can have the same three possibilities: a specific value, positive infinity, or negative infinity.

To determine the presence and value of a horizontal asymptote, you can analyze the coefficients and degrees of the terms in the function. Here are some general guidelines:

1. If the degree of the numerator (highest power of x) is greater than the degree of the denominator, there is no horizontal asymptote.

2. If the degree of the denominator is greater than the degree of the numerator, then the horizontal asymptote is y = 0.

3. If the degrees of the numerator and denominator are equal, divide the leading coefficients of both the numerator and denominator. The resulting value will be the horizontal asymptote.

It is important to note that not all functions have horizontal asymptotes. Some functions may have slant asymptotes or no asymptotes at all. It is necessary to analyze the behavior of the function as x approaches infinity or negative infinity to determine the presence and properties of horizontal asymptotes.

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