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In Exercises, sketch the graph of the function. $$ f(x)=e^{2 x} $$

Short Answer

Expert verified
The function \(f(x) = e^{2x}\) being an exponential function has a specific shape. It passes the point (0, 1), inclines as \(x\) increases, and the \(y\)-axis is its horizontal asymptote. This can be verified by calculating the function's values at various points and plotting them.

Step by step solution

01

Understanding the exponential function

Exponential functions of the form \(f(x) = a^x\), where \(a\) is a positive real number not equal to 1, have a characteristic shape. They always pass through the point (0, 1) and, in the case where \(a > 1\) , they increase, becoming steeper as \(x\) increases.
02

Calculate the function's value at various points

Calculate the function's value at a few key points for sketching the graph. Some relevant points would be \(x = -2, -1, 0, 1, 2\). Then we compute the respective \(f(x)\) for those values: \(f(-2) = e^{-4}\), \(f(-1) = e^{-2}\), \(f(0) = e^0 = 1\), \(f(1) = e^2\), \(f(2) = e^4\).
03

Plotting the function

Now we plot these calculated points along with the defining characteristics of the exponential function to accurately draw the function. The function should pass through the points (0,1), inclines as \(x\) increases and have an asymptote at \(y=0\)

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Graphing Functions
When graphing exponential functions like \( f(x) = e^{2x} \), it's important to understand their typical characteristics. Graphing involves plotting the function on a coordinate plane to visually represent its behavior. In the case of our function, it has an exponential form, meaning it rises sharply with increasing \( x \). This sharp rise is a hallmark of exponential growth.Graphs of exponential functions usually start below the x-axis for negative \( x \), cross the y-axis at some value, and continue upwards as \( x \) increases. These functions also have a horizontal asymptote, which is an invisible line that the function gets closer to but never actually touches, typically along the x-axis (or \( y = 0 \)).To sketch this function, you should:
  • Identify key points: For \( f(x) = e^{2x} \), the graph passes through (0, 1), since \( e^0 = 1 \).
  • Find additional points by calculating \( f(x) \) for several \( x \) values such as \( -2, -1, 0, 1, 2 \).
  • Draw the graph starting from the left, moving upwards sharply, and approaching the horizontal asymptote without touching it.
Function Behavior
The behavior of an exponential function is defined by how it changes as the input \( x \) changes. For \( f(x) = e^{2x} \), this change is exponential, meaning its rate of increase grows faster as \( x \) becomes larger.Some key behavioral aspects of exponential functions include:
  • **Monotonically increasing:** This function always increases because the base \( e \) (approximately 2.718) is greater than 1. As \( x \) increases, \( f(x) \) will never decrease.
  • **Smooth curve:** The graph is continuous and smooth, with no breaks, jumps, or abrupt changes.
  • **Y-intercept:** The function crosses the y-axis at \( y=1 \) because \( f(0) = e^0 = 1 \).
Understanding these characteristics can help in predicting how the graph will look and how the function behaves as \( x \) approaches positive or negative infinity.
Exponential Growth
Exponential functions like \( f(x) = e^{2x} \) represent exponential growth, a powerful concept used in various scientific fields and real-life scenarios. This growth is characterized by the quantity doubling quickly over equal intervals of time.In our function:
  • \( e^{2x} \) indicates very rapid growth since the exponent is positive and multi-fold (twice the regular \( e^x \)). It grows even faster compared to simpler exponential functions like \( e^x \).
  • This rapid growth is why exponential functions are frequently used to model populations, financial predictions, and natural processes, where quantities grow at increasing rates.
To better understand exponential growth, think about scenarios where small initial stages might seem negligible, but yielding significant consequences over time – just like the function \( f(x) = e^{2x} \) skyrocketing as \( x \) increases.

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Most popular questions from this chapter

The term \(t\) (in years) of a \(\$ 200,000\) home mortgage at \(7.5 \%\) interest can be approximated by \(t=-13.375 \ln \frac{x-1250}{x}, x>1250\) where \(x\) is the monthly payment in dollars. (a) Use a graphing utility to graph the model. (b) Use the model to approximate the term of a home mortgage for which the monthly payment is \(\$ 1398.43 .\) What is the total amount paid? (c) Use the model to approximate the term of a home mortgage for which the monthly payment is \(\$ 1611.19 .\) What is the total amount paid? (d) Find the instantaneous rate of change of \(t\) with respect to \(x\) when \(x=\$ 1398.43\) and \(x=\$ 1611.19\). (e) Write a short paragraph describing the benefit of the higher monthly payment.

The sales for exercise equipment in the United States were \(\$ 1824\) million in 1990 and \(\$ 5112\) million in 2005. (a) Use the regression feature of a graphing utility to find an exponential growth model and a linear model for the data. (b) Use the exponential growth model to estimate the sales in 2011 . (c) Use the linear model to estimate the sales in 2011 . (d) Use a graphing utility to graph the models from part (a). Which model is more accurate?

In Exercises, graph and analyze the function. Include any relative extrema and points of inflection in your analysis. Use a graphing utility to verify your results. $$ y=x \ln x $$

In Exercises, use a calculator to evaluate the logarithm. Round to three decimal places. $$ \log _{5} 12 $$

In Exercises, use the given information to write an equation for \(y\). Confirm your result analytically by showing that the function satisfies the equation \(d y / d t=C y .\) Does the function represent exponential growth or exponential decay? $$ \frac{d y}{d t}=2 y, \quad y=10 \text { when } t=0 $$

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