Question

In the following exercises, solve

(a)$\left|x\right|=7$

(b)$\left|y\right|=-11$

(c)$\left|z\right|=0$

Short answer

The required solutions are

(a)$x=\pm 7$

(b) No solution

(c)$z=0$

Step-by-step solution

 Part (a) Step 1: Given information

$\left|x\right|=7$

Part (a) Step 2: Calculation

The equivalent equations are

$$\begin{gathered} x=-7orx=7 \\ \Rightarrow x=\pm 7 \end{gathered}$$

Part (b) Step 1: Given information

$\left|y\right|=-11$

Part (b) Step 2: Calculation

No solution, since an absolute value is always positive .

Part (c) Step 1: Given information

$\left|z\right|=0$

Part (c) Step 2: Calculation

$$\begin{gathered} z=-0orz=0 \\ SInce-0=0 \\ \Rightarrow z=0 \end{gathered}$$

The required solutions are

(a)$x=\pm 7$

(b)No solution

(c)$z=0$