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Which function results after applying the sequence of transformations to [tex]f(x)=x^5[/tex]?

- Shift left 1 unit
- Vertically compress by [tex]\frac{1}{3}[/tex]
- Reflect over the [tex]y[/tex]-axis

A. [tex]f(x)=\left(-\frac{1}{3} x+1\right)^5[/tex]
B. [tex]f(x)=\frac{1}{3}(-x+1)^5[/tex]
C. [tex]f(x)=\frac{1}{3}(-x)^5+1[/tex]
D. [tex]f(x)=\frac{1}{3}(-x-1)^5[/tex]


Sagot :

Let's start with the initial function [tex]\( f(x) = x^5 \)[/tex] and apply the given transformations step by step.

1. Shift left by 1 unit:
When we shift a function [tex]\( f(x) \)[/tex] to the left by 1 unit, we replace [tex]\( x \)[/tex] with [tex]\( x + 1 \)[/tex]. Thus,
[tex]\[ f(x) = x^5 \quad \Rightarrow \quad f(x+1) = (x+1)^5 \][/tex]

2. Reflect over the [tex]\( y \)[/tex]-axis:
Reflecting a function over the [tex]\( y \)[/tex]-axis involves replacing [tex]\( x \)[/tex] with [tex]\( -x \)[/tex]. So, we apply this to the shifted function:
[tex]\[ f(x+1) = (x+1)^5 \quad \Rightarrow \quad f(-x+1) = (-x+1)^5 \][/tex]

3. Vertically compress by [tex]\(\frac{1}{3}\)[/tex]:
To vertically compress a function by [tex]\(\frac{1}{3}\)[/tex], we multiply the function by [tex]\(\frac{1}{3}\)[/tex]. Thus,
[tex]\[ f(-x+1) = (-x+1)^5 \quad \Rightarrow \quad \frac{1}{3}(-x+1)^5 \][/tex]

So, after applying all the transformations to [tex]\( f(x) = x^5 \)[/tex], the resulting function is
[tex]\[ \boxed{\frac{1}{3}(-x+1)^5} \][/tex]

Comparing this result to the options provided:

A. [tex]\( f(x) = \left(-\frac{1}{3} x + 1\right)^5 \)[/tex]

B. [tex]\( f(x) = \frac{1}{3}(-x+1)^5 \)[/tex]

C. [tex]\( f(x) = \frac{1}{3}(-x)^5 + 1 \)[/tex]

D. [tex]\( f(x) = \frac{1}{3}(-x-1)^5 \)[/tex]

The correct answer is:
[tex]\[ \boxed{B} \][/tex]