How to Scale a Function Horizontally?
Horizontal scaling means stretching or shrinking the diagram of function along the \(x\)-axis. In the following guide, you will learn how to horizontal scaling.
![How to Scale a Function Horizontally?](https://www.effortlessmath.com/wp-content/uploads/2022/03/Blog-How-to-Scale-a-Function-Horizontally-512x240.jpg)
Horizontal scaling refers to the shrinking or stretching of the curve along the \(x\)-axis by some specific units.
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A step-by-step guide to horizontal scaling
Horizontal scaling means stretching or shrinking the diagram of function along the \(x\)-axis. The horizontal scale can be done by multiplying the input by a constant.
Consider the following example:
If we have a function,\(y=f(x)\), the horizontal scaling of this function can be written as: \(y=f(Cx)\).
Note:
- If \(C>1\), the graph shrinks.
- If \(C<1\), the graph stretches.
How is a graph scaled horizontally?
- Step 1: Select a constant with which we want to scale the function.
- Step 2: Write the new function as \(g(x)=fC(x)\), where \(C\) is the constant.
- Step 3: Trace the new function graph by replacing each value of \(x\) with \(Cx\).
- Step 4: \(X\) coordinate of each point in the graph is multiplied by \(±C\), and the curve shrinks or stretches accordingly.
Horizontal Scaling – Example 1:
Horizontally stretch the function \(f(x)=x+2\) by a factor of \(2\) units.
![](https://www.effortlessmath.com/wp-content/uploads/2022/03/Untitled39.png)
Exercises for Horizontal Scaling
- Horizontal scaling of function \(f(x) = sin x\) by a factor of \(-3\).
![This image has an empty alt attribute; its file name is Graphing-Rational-Expressions-Example-3-1.png](https://www.effortlessmath.com/wp-content/uploads/2021/12/Graphing-Rational-Expressions-Example-3-1.png)
- Horizontal scaling of function \(f(x) =x^2+3x+2\) by a factor of \(4\).
![This image has an empty alt attribute; its file name is Graphing-Rational-Expressions-Example-3-1.png](https://www.effortlessmath.com/wp-content/uploads/2021/12/Graphing-Rational-Expressions-Example-3-1.png)
![This image has an empty alt attribute; its file name is answers.png](https://www.effortlessmath.com/wp-content/uploads/2019/12/answers.png)
![](https://www.effortlessmath.com/wp-content/uploads/2022/03/Untitled4.png)
![](https://www.effortlessmath.com/wp-content/uploads/2022/03/Untitled6.png)
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