Which is the correct piecewise definition for the function y=|x+5|-2

1 answer

The function \( y = |x + 5| - 2 \) can be expressed as a piecewise function by considering the definition of the absolute value. The expression \( |x + 5| \) can be defined based on whether the inside expression \( x + 5 \) is non-negative or negative.

  1. If \( x + 5 \geq 0 \) (or \( x \geq -5 \)), then \( |x + 5| = x + 5 \).
  2. If \( x + 5 < 0 \) (or \( x < -5 \)), then \( |x + 5| = -(x + 5) = -x - 5 \).

Now, we can write the piecewise definition for the function \( y \):

\[ y = \begin{cases} (x + 5) - 2 & \text{if } x \geq -5 \ (-x - 5) - 2 & \text{if } x < -5 \end{cases} \]

This simplifies to:

\[ y = \begin{cases} x + 3 & \text{if } x \geq -5 \ -x - 7 & \text{if } x < -5 \end{cases} \]

Thus, the correct piecewise definition for \( y = |x + 5| - 2 \) is:

\[ y = \begin{cases} x + 3 & \text{if } x \geq -5 \ -x - 7 & \text{if } x < -5 \end{cases} \]