Chapter 4: Problem 6
Graph each function. If you are using a graphing calculator, make a hand-drawn sketch from the screen. $$ y=5^{x} $$
Short Answer
Expert verified
The graph of \( y = 5^x \) is an exponential curve crossing the y-axis at (0, 1) and rising sharply for positive \( x \).
Step by step solution
01
Understanding the Function
The function given is an exponential function, \( y = 5^x \), which means that as \( x \) increases or decreases, the function will response exponentially by increasing or decreasing itself exponentially.
02
Identifying Key Points
To graph the function, first identify a few key points. Start with the point where \( x = 0 \). In this case, \( y = 5^0 = 1 \). So the point \((0, 1)\) is on the graph. Another point is where \( x = 1 \), giving us \( y = 5^1 = 5 \). For \( x = -1 \), \( y = 5^{-1} = \frac{1}{5} \). These points help us to plot the curve.
03
Plotting Additional Points
Choose some additional points to get a better shape of the graph. For instance, \( x = 2 \) gives \( y = 5^2 = 25 \) and \( x = -2 \) gives \( y = 5^{-2} = \frac{1}{25} \). This exponential function quickly increases for positive values of \( x \) and approaches zero for negative values of \( x \).
04
Drawing the Graph
Start plotting the points on a coordinate plane. Begin with the points: \((0, 1)\), \((1, 5)\), \((2, 25)\), \((-1, \frac{1}{5})\), and \((-2, \frac{1}{25})\). Draw a smooth curve through these points extending to the right and approaching the x-axis on the left, noting the exponential growth.
05
Analyzing the Graph Behavior
Notice how the graph crosses the y-axis at \( (0, 1) \) and increases exponentially as \( x \) increases. To the left (negative \( x \)), the graph declines but never touches the x-axis, indicating it approaches zero asymptotically.
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Graphing Techniques
To graph the function \( y = 5^x \), it's important to understand some basic graphing techniques. Start by carefully selecting and plotting key points that will give you a sketch of the curve. For exponential functions like \( y = 5^x \), it's useful to choose easily computable points. These typically include values of \( x \) such as 0, 1, and -1.
This is because they yield simple values: \( 5^0 = 1 \), \( 5^1 = 5 \), and \( 5^{-1} = \frac{1}{5} \). By including additional points like \( x = 2 \) which gives \( 5^2 = 25 \), you achieve a broader view of the graph's stretching.
This is because they yield simple values: \( 5^0 = 1 \), \( 5^1 = 5 \), and \( 5^{-1} = \frac{1}{5} \). By including additional points like \( x = 2 \) which gives \( 5^2 = 25 \), you achieve a broader view of the graph's stretching.
- Begin by plotting each point: \((0, 1)\), \((1, 5)\), \((2, 25)\), \((-1, \frac{1}{5})\), and \((-2, \frac{1}{25})\).
- Remember that exponential functions rapidly increase or decrease, so the graph should reflect this behavior through a smooth curve.
Exponential Growth
Exponential growth is a fundamental concept when dealing with functions like \( y = 5^x \). This form of growth means that the rate of increase becomes more pronounced with larger values of \( x \).
In essence, each step you take in the positive \( x \)-direction multiplies the current value of \( y \) by the base of the exponent, which in this case is 5. Therefore, moving from \( x = 0 \) to \( x = 1 \) multiplies \( y \) by 5, transforming \( 5^0 = 1 \) to \( 5^1 = 5 \).
In essence, each step you take in the positive \( x \)-direction multiplies the current value of \( y \) by the base of the exponent, which in this case is 5. Therefore, moving from \( x = 0 \) to \( x = 1 \) multiplies \( y \) by 5, transforming \( 5^0 = 1 \) to \( 5^1 = 5 \).
- When \( x \) is negative, the value of \( y \) approaches zero, because you are essentially taking smaller and smaller fractions of 1.
- This results in the graph tracing close to the x-axis but never actually touching it, a behavior known as asymptotic.
Coordinate Plane
The coordinate plane is essential for visualizing mathematical functions like \( y = 5^x \). It consists of two axes: the horizontal \( x \)-axis and the vertical \( y \)-axis. Every function can be expressed as a set of points on this plane.
For \( y = 5^x \), the coordinate plane helps align the exponential growth pattern in a visual context. Begin by setting a scale that accommodates the exponentially growing \( y \)-values—perhaps using larger units for \( y \) to encompass large ups like from \((1, 5)\) to \((2, 25)\).
For \( y = 5^x \), the coordinate plane helps align the exponential growth pattern in a visual context. Begin by setting a scale that accommodates the exponentially growing \( y \)-values—perhaps using larger units for \( y \) to encompass large ups like from \((1, 5)\) to \((2, 25)\).
- Plot the key points mentioned earlier: \((0, 1)\), \((1, 5)\), \((2, 25)\).
- Also, don't forget about \(( -1, \frac{1}{5})\) and \(( -2, \frac{1}{25})\) to capture the rapid decline toward zero in the negative \( x \)-direction.