Westonci.ca is the premier destination for reliable answers to your questions, brought to you by a community of experts. Explore comprehensive solutions to your questions from knowledgeable professionals across various fields on our platform. Experience the convenience of finding accurate answers to your questions from knowledgeable experts on our platform.

Consider this absolute value function:

[tex]\[ f(x) = |x + 3| \][/tex]

How can function [tex]\( f \)[/tex] be rewritten as a piecewise function?

[tex]\[
f(x) =
\begin{cases}
x + 3 & \text{if } x \geq -3 \\
-x - 3 & \text{if } x \ \textless \ -3
\end{cases}
\][/tex]


Sagot :

To rewrite the absolute value function [tex]\( f(x) = |x+3| \)[/tex] as a piecewise function, you need to consider the behavior of the absolute value expression based on the value of [tex]\( x \)[/tex]. The absolute value function can be expressed as a piecewise function considering two cases:

1. When the expression inside the absolute value is non-negative, i.e., [tex]\( x + 3 \geq 0 \Rightarrow x \geq -3 \)[/tex].
2. When the expression inside the absolute value is negative, i.e., [tex]\( x + 3 < 0 \Rightarrow x < -3 \)[/tex].

For [tex]\( x \geq -3 \)[/tex], the absolute value function returns the expression itself:
[tex]\[ f(x) = x + 3 \][/tex]

For [tex]\( x < -3 \)[/tex], the absolute value function returns the negation of the expression:
[tex]\[ f(x) = -(x + 3) = -x - 3 \][/tex]

Putting it together, the piecewise function is:

[tex]\[ f(x) = \begin{cases} x + 3 & \text{if } x \geq -3 \\ -x - 3 & \text{if } x < -3 \end{cases} \][/tex]

So, the correct arrangement of the pieces is:
[tex]\[ f(x) = \begin{cases} x + 3 & \text{if } x \geq -3 \\ -x - 3 & \text{if } x < -3 \end{cases} \][/tex]