Textbook Question
Analyze the following limits. Then sketch a graph of y=tanx with the window [−π,π]×[−10,10]and use your graph to check your work.
lim x→π/2^− tan x
1. Limits and Continuity
Introduction to Limits
2:28 minutesProblem 2.4.62
Textbook Question
Use analytical methods and/or a graphing utility to identify the vertical asymptotes (if any) of the following functions.
h(x)=e^x(x+1)^3
Verified step by step guidance1
Step 1: Identify the form of the function h(x) = e^x (x+1)^3. Notice that it is a product of an exponential function and a polynomial.
Step 2: Recall that vertical asymptotes occur where the function is undefined or where the limit of the function approaches infinity as x approaches a certain value.
Step 3: Analyze the polynomial part (x+1)^3. Vertical asymptotes typically occur where the denominator of a rational function is zero, but since (x+1)^3 is not in the denominator, it does not contribute to vertical asymptotes.
Step 4: Consider the exponential part e^x. The exponential function e^x is defined for all real numbers and does not contribute to vertical asymptotes.
Step 5: Conclude that since neither part of the function h(x) = e^x (x+1)^3 leads to division by zero or undefined behavior, there are no vertical asymptotes for this function.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Vertical Asymptotes
Vertical asymptotes occur in a function when the output approaches infinity as the input approaches a certain value. This typically happens when the function is undefined at that point, often due to division by zero. Identifying vertical asymptotes involves finding values of x that make the denominator of a rational function zero, while ensuring the numerator is not also zero at those points.
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Exponential Functions
Exponential functions, such as h(x) = e^x, are characterized by a constant base raised to a variable exponent. These functions grow rapidly and are always positive, meaning they do not have vertical asymptotes. Understanding their behavior is crucial when analyzing composite functions, as they can influence the overall shape and limits of the function.
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Polynomial Functions
Polynomial functions, like (x+1)^3, are expressions consisting of variables raised to whole number powers. They are continuous and defined for all real numbers, meaning they do not have vertical asymptotes. Analyzing the degree and roots of polynomial functions helps in understanding their behavior, particularly in conjunction with other function types in composite expressions.
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