Chapter 1: Problem 87
The point \((a, b)\) lies on the graph of the function \(y=f(x)\). What point is guaranteed to lie on the graph of \(f(x-3)+2 ?\)
Short Answer
Expert verified
The point \((a+3, b+2)\) is on the graph of \(f(x-3) + 2\).
Step by step solution
01
Understand the Problem
We have a function \(y = f(x)\) with a known point \((a, b)\) lying on its graph. We need to identify the corresponding point on the transformed function \(f(x-3) + 2\).
02
Analyze the Transformation
The transformation involves two steps: a horizontal shift and a vertical shift. * The expression \(f(x-3)\) indicates a horizontal shift to the right by 3 units.* The expression \(+2\) indicates a vertical shift upwards by 2 units.
03
Apply Horizontal Shift
To apply the horizontal shift, increase the x-coordinate of the point \((a,b)\) by 3. This results in the new x-coordinate being \(a+3\).
04
Apply Vertical Shift
To apply the vertical shift, increase the y-coordinate of the point \((a, b)\) by 2. This results in the new y-coordinate being \(b+2\).
05
Determine the Transformed Point
The transformed point, taking both shifts into account, is \((a+3, b+2)\).
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Horizontal Shift
A horizontal shift involves moving the graph of a function left or right along the x-axis. If the transformation is in the form \(f(x-h)\), then the graph shifts horizontally. Here's what happens:
For example, if the original point is \((a, b)\), after the horizontal shift, the new x-coordinate becomes \(a+3\). This only affects the x-coordinate. The y-coordinate remains unchanged during a horizontal shift. It's essential to remember this distinction when analyzing graphs, as it allows us to predict the movement accurately.
- To the right: If \(h\) is positive, meaning \(f(x-h)\), the graph will shift \(h\) units to the right.
- To the left: If \(h\) is negative, meaning \(f(x+h)\), the graph will shift \(|h|\) units to the left.
For example, if the original point is \((a, b)\), after the horizontal shift, the new x-coordinate becomes \(a+3\). This only affects the x-coordinate. The y-coordinate remains unchanged during a horizontal shift. It's essential to remember this distinction when analyzing graphs, as it allows us to predict the movement accurately.
Vertical Shift
A vertical shift moves a graph up or down along the y-axis. This transformation affects the y-coordinate of the points on the graph. It can be represented by \(f(x) + k\):
This means each point's y-coordinate will increase by 2. Given a point \((a, b)\), the vertical shift will change it to \((a, b+2)\). The x-coordinate is unaffected by this type of shift.
Understanding vertical shifts is crucial in graph transformations, as they directly affect how a function appears along the y-axis, altering its position without changing its shape.
- Upwards: If \(k\) is positive, the graph shifts upwards by \(k\) units.
- Downwards: If \(k\) is negative, the graph shifts downwards by \(|k|\) units.
This means each point's y-coordinate will increase by 2. Given a point \((a, b)\), the vertical shift will change it to \((a, b+2)\). The x-coordinate is unaffected by this type of shift.
Understanding vertical shifts is crucial in graph transformations, as they directly affect how a function appears along the y-axis, altering its position without changing its shape.
Graph of a Function
The graph of a function visually represents the relationship between the input values (x-coordinates) and the output values (y-coordinates). Each point on the graph is a solution to the function, expressed as \((x, y)\). Transformations, such as shifting, allow us to manipulate these graphs without changing the function's fundamental nature.
When a function experiences a horizontal or vertical shift, the shape of the graph remains the same, but its position changes on the coordinate plane:
When a function experiences a horizontal or vertical shift, the shape of the graph remains the same, but its position changes on the coordinate plane:
- Horizontal Shift: Moves the entire graph left or right, altering x-coordinates.
- Vertical Shift: Moves the graph up or down, changing y-coordinates.