Chapter 2: Problem 7
Sketch a graph of each function $$ f(x)=2|x+3|+1 $$
Short Answer
Expert verified
The graph is a vertically stretched and vertically shifted 'V' shape centered at \((-3, 1)\).
Step by step solution
01
Identify the Basic Function
The given function is based on the absolute function \( |x| \). Start by considering \( f(x) = |x+3| \) to understand its basic shape, which forms a 'V' graph centered on the x-axis.
02
Apply Horizontal Transformation
The expression inside the absolute value \( x+3 \) implies a horizontal transformation. The graph of \( |x| \) is shifted 3 units to the left, centering the 'V' shape at \( x = -3 \).
03
Apply Vertical Stretch
The coefficient 2 in front of \( |x+3| \) indicates a vertical stretch of the graph. It will make the 'V' shape narrower compared to the standard \( |x| \) graph, multiplying the y-values by 2.
04
Apply Vertical Translation
The final step is the vertical translation. The entire graph is shifted upwards by 1 unit because of the '+1' at the end of the expression.
05
Draw the Graph
Combine all transformations to sketch the graph. Start by drawing a 'V' centered at \( x = -3 \), stretch it vertically, and finally shift it up by 1 unit. The vertex of the transformed graph is at \( (-3, 1) \), and the graph opens upwards, moving away from this vertex.
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
graph transformations
Graph transformations allow us to adjust the shape and position of a graph without changing its fundamental characteristics. These transformations include shifting, stretching, and reflecting the graph. For absolute value functions like \( f(x) = 2|x+3|+1 \), graph transformations are used to change the position and the appearance of the 'V' shape graph. Understanding graph transformations involves analyzing each part of the function:
- The expression inside the absolute value sign, \( x+3 \), affects horizontal translations.
- The coefficient in front of the absolute value, \( 2 \), affects vertical stretches.
- The constant at the end, \( +1 \), determines vertical translations.
vertical stretch
A vertical stretch is a type of transformation that alters the y-coordinates of a graph, making it appear taller or shorter without changing its base structure. In our function \( f(x) = 2|x+3|+1 \), the '2' before the absolute value signifies this stretch.A vertical stretch happens when a function is multiplied by a factor greater than 1. Here, every y-value from the basic \( |x| \) graph is multiplied by 2, resulting in a narrower 'V' shape. This is because the graph stretches away from the x-axis, making it steeper.Visualizing this, if the original 'V' crossed the y-axis at points like \( (0, 0) \), those points would now double, standing taller at \( (0, 0) \) and a hypothetical number like \( (0, 2) \). Essentially, each y-coordinate is "stretched" vertically.
horizontal translation
Horizontal translation is a transformation in graphs where the entire graph shifts left or right along the x-axis. For absolute value functions like in our problem, horizontal translations are controlled by changes within the absolute value expression.In \( f(x) = 2|x+3|+1 \), the term \( x+3 \) leads to a horizontal shift. This translates the basic \( |x| \) graph 3 units to the left, from a center of \( x=0 \) to \( x=-3 \). Understanding horizontal translations involves recognizing that whatever you add or subtract inside the absolute value will shift the graph in the opposite direction. For example, \( +3 \) inside moves it left. This adjustment is crucial to accurately graphing transformations as it correctly positions the 'V' shape before applying other changes.