Explain the meaning of lim x→−∞ f(x)=10.

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Step 1: Understand the notation: The expression \( \lim_{x \to -\infty} f(x) = 10 \) is read as 'the limit of \( f(x) \) as \( x \) approaches negative infinity is 10.'

Step 2: Conceptualize the behavior: This means that as \( x \) becomes very large in the negative direction (i.e., \( x \) goes to negative infinity), the values of the function \( f(x) \) get closer and closer to 10.

Step 3: Visualize the graph: Imagine the graph of \( f(x) \). As you move left along the x-axis towards negative infinity, the y-values (outputs of \( f(x) \)) approach the horizontal line \( y = 10 \).

Step 4: Consider the horizontal asymptote: The line \( y = 10 \) can be considered a horizontal asymptote of the function \( f(x) \) as \( x \to -\infty \). This means the graph of \( f(x) \) gets closer to this line but may not necessarily touch or cross it.

Step 5: Relate to real-world scenarios: In practical terms, this limit could represent a situation where a quantity stabilizes at a certain value (10 in this case) as time or another variable decreases without bound.

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주요 개념

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Limit at Infinity

The limit at infinity describes the behavior of a function as the input approaches infinity or negative infinity. Specifically, lim x→−∞ f(x)=10 indicates that as x decreases without bound, the values of f(x) approach 10. This concept is crucial for understanding how functions behave in extreme cases.

Horizontal Asymptote

A horizontal asymptote is a horizontal line that a graph approaches as x approaches infinity or negative infinity. In this case, the line y=10 serves as a horizontal asymptote for the function f(x) as x approaches negative infinity, indicating that f(x) stabilizes around this value rather than diverging.

Function Behavior

Understanding function behavior involves analyzing how a function changes as its input varies. The statement lim x→−∞ f(x)=10 suggests that for very large negative values of x, the function f(x) behaves consistently, converging to the value 10, which is essential for predicting the function's long-term trends.