Chapter 2: Problem 76
Let the domain of \(f(x)\) be \([-1,2]\) and the range be \([0,3] .\) Find the domain and range of the following. $$\frac{1}{3} f(x-3)$$
Short Answer
Expert verified
Domain: [2, 5]; Range: [0, 1].
Step by step solution
01
- Understand the given function
We have a function \(f(x)\) with a specified domain of \([-1, 2]\) and range \([0, 3]\). Our task is to find the domain and range of the transformed function \(\frac{1}{3} f(x-3)\).
02
- Analyze the transformation on the domain
The expression \(f(x-3)\) shifts the graph of \(f(x)\) to the right by 3 units. Original domain \([-1, 2]\) is transformed to \([2, 5]\) by adding 3 to each endpoint.
03
- Determine the domain of the transformed function
Since the transformation involves shifting the function to the right by 3 units, the new domain of \(\frac{1}{3} f(x-3)\) is \([2, 5]\).
04
- Analyze the transformation on the range
The function \(\frac{1}{3} f(x-3)\) involves multiplying the output of \(f(x-3)\) by \(\frac{1}{3}\). This scales the original range \([0, 3]\) by \(\frac{1}{3}\), resulting in the range \([0, 1]\).
05
- Determine the range of the transformed function
The multiplication by \(\frac{1}{3}\) scales every value in the original range, so the new range is \([0, 1]\).
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Domain
In mathematics, the domain of a function refers to all the possible input values (usually represented by \(x\) values) that a function can accept without resulting in undefined behavior. For the function \(f(x)\), the given domain is \([-1, 2]\). This means the function is defined and can accept any \(x\) values from -1 to 2 inclusively.
Now, to find the domain of the transformed function \(\frac{1}{3} f(x-3)\), we need to consider the impact of the transformation \(x - 3\). This expression indicates a horizontal shift. Specifically, it moves the entire graph of \(f(x)\) right by 3 units.
Now, to find the domain of the transformed function \(\frac{1}{3} f(x-3)\), we need to consider the impact of the transformation \(x - 3\). This expression indicates a horizontal shift. Specifically, it moves the entire graph of \(f(x)\) right by 3 units.
- Add 3 to each endpoint of the original domain.
- Transform \([-1, 2]\) to \([2, 5]\).
Range
The range of a function represents all possible output values (often represented by \(y\) values) that a function can produce. For the given function \(f(x)\), the range is \([0, 3]\), meaning that the possible outputs for this function are values between 0 and 3, inclusively.
When we examine the transformation \(\frac{1}{3} f(x-3)\), it involves multiplying each output of \(f(x-3)\) by \(\frac{1}{3}\).
When we examine the transformation \(\frac{1}{3} f(x-3)\), it involves multiplying each output of \(f(x-3)\) by \(\frac{1}{3}\).
- This operation scales the original range by \(\frac{1}{3}\).
- The original outputs that ranged from 0 to 3 are now transformed to a new range of \([0, 1]\).
Function Shifting
Function shifting is a transformation that moves the graph of a function either horizontally or vertically without changing its shape. In our problem, \(f(x)\) undergoes a horizontal shift represented by \(f(x-3)\).
This specific transformation causes the entire graph of \(f(x)\) to move 3 units to the right.
This specific transformation causes the entire graph of \(f(x)\) to move 3 units to the right.
- Horizontal shifts are achieved by adding or subtracting a constant from \(x\) in the function.
- Adding \(-3\) to \(x\) shifts the graph right, impacting the original domain \([-1, 2]\) to become \([2, 5]\).
Scaling Function
A scaling of a function involves expanding or compressing the graph in the vertical direction. This transformation directly affects the output values (range) of the function.
In the expression \(\frac{1}{3} f(x-3)\), the function's output values are scaled by the factor of \(\frac{1}{3}\).
In the expression \(\frac{1}{3} f(x-3)\), the function's output values are scaled by the factor of \(\frac{1}{3}\).
- This means that every \(y\)-value is reduced to one-third of its original value.
- The range of \(f(x)\) was \([0, 3]\), but once each output is multiplied by \(\frac{1}{3}\), the range becomes \([0, 1]\).