Textbook Question
Find
a. (fog) (x)
b. (go f) (x)
c. (fog) (2)
d. (go f) (2).
f(x) = 2x, g(x) = x+7
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3. Functions
Intro to Functions & Their Graphs
1:13 minutesProblem 83a
Textbook Question
Use the graphs of f and g to solve Exercises 83–90.
Find (f+g)(−3).
Verified step by step guidance1
Step 1: Understand the problem. You are tasked with finding (f+g)(−3), which means you need to evaluate f(−3) and g(−3) from the graph and then add the two values together.
Step 2: Locate x = −3 on the graph. Look at the blue graph labeled y = f(x) and the red graph labeled y = g(x) to find the corresponding y-values for x = −3.
Step 3: Determine f(−3). Find the point on the blue graph where x = −3 and note the y-coordinate of that point. This is the value of f(−3).
Step 4: Determine g(−3). Find the point on the red graph where x = −3 and note the y-coordinate of that point. This is the value of g(−3).
Step 5: Add the values. Once you have f(−3) and g(−3), add them together to find (f+g)(−3).
Verified video answer for a similar problem:This video solution was recommended by our tutors as helpful for the problem above
Video duration:
1mKey Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Function Addition
Function addition involves combining two functions, f(x) and g(x), to create a new function (f + g)(x) defined as (f + g)(x) = f(x) + g(x). This operation requires evaluating both functions at a given input and summing their outputs. Understanding how to read and interpret function values from graphs is essential for performing this operation.
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Evaluating Functions from Graphs
To evaluate functions from their graphs, one must locate the x-value on the horizontal axis and determine the corresponding y-value on the vertical axis for each function. For the question, finding (f + g)(−3) requires first identifying f(−3) and g(−3) from their respective graphs, then adding these values together to find the result.
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Graph Interpretation
Graph interpretation is the ability to analyze and extract information from visual representations of functions. This includes recognizing key features such as intercepts, slopes, and the overall shape of the graph. In this context, understanding how to read the graphs of f(x) and g(x) is crucial for accurately determining their values at specific points, such as x = -3.
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02:16Graphs and Coordinates - Example
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