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.
Horizontal scaling refers to the shrinking or stretching of the curve along the \(x\)-axis by some specific units.
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: \(y=f(Cx)\).
- 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.
Exercises for Horizontal Scaling
- Horizontal scaling of function \(f(x) = sin x\) by a factor of \(-3\).
- Horizontal scaling of function \(f(x) =x^2+3x+2\) by a factor of \(4\).
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