Graph f(x)=10-|x|

$f (x) = 10 - | x |$

Step 1

Find the absolute value vertex. In this case, the vertex for $y = 10 - | x |$ is $(0, 10)$ .

To find the $x$ coordinate of the vertex, set the inside of the absolute value $x$ equal to $0$ . In this case, $x = 0$ .

$x = 0$

Replace the variable $x$ with $0$ in the expression.

$y = 10 - | 0 |$

Simplify $10 - | 0 |$ .

Simplify each term.

The absolute value is the distance between a number and zero. The distance between $0$ and $0$ is $0$ .

$y = 10 - 0$

Multiply $- 1$ by $0$ .

$y = 10 + 0$

Add $10$ and $0$ .

$y = 10$

The absolute value vertex is $(0, 10)$ .

$(0, 10)$

Step 2

The domain of the expression is all real numbers except where the expression is undefined. In this case, there is no real number that makes the expression undefined.

Interval Notation:

$(- \infty, \infty)$

Set-Builder Notation:

${x | x \in ℝ}$

Step 3

For each $x$ value, there is one $y$ value. Select a few $x$ values from the domain. It would be more useful to select the values so that they are around the $x$ value of the absolute value vertex.

Substitute the $x$ value $- 2$ into $f (x) = 10 - | x |$ . In this case, the point is $(- 2, 8)$ .

Replace the variable $x$ with $- 2$ in the expression.

$f (- 2) = 10 - | - 2 |$

Simplify the result.

Simplify each term.

The absolute value is the distance between a number and zero. The distance between $- 2$ and $0$ is $2$ .

$f (- 2) = 10 - 1 \cdot 2$

Multiply $- 1$ by $2$ .

$f (- 2) = 10 - 2$

Subtract $2$ from $10$ .

$f (- 2) = 8$

The final answer is $8$ .

$y = 8$

Substitute the $x$ value $- 1$ into $f (x) = 10 - | x |$ . In this case, the point is $(- 1, 9)$ .

Replace the variable $x$ with $- 1$ in the expression.

$f (- 1) = 10 - | - 1 |$

Simplify the result.

Simplify each term.

The absolute value is the distance between a number and zero. The distance between $- 1$ and $0$ is $1$ .

$f (- 1) = 10 - 1 \cdot 1$

Multiply $- 1$ by $1$ .

$f (- 1) = 10 - 1$

Subtract $1$ from $10$ .

$f (- 1) = 9$

The final answer is $9$ .

$y = 9$

Substitute the $x$ value $2$ into $f (x) = 10 - | x |$ . In this case, the point is $(2, 8)$ .

Replace the variable $x$ with $2$ in the expression.

$f (2) = 10 - | 2 |$

Simplify the result.

Simplify each term.

The absolute value is the distance between a number and zero. The distance between $0$ and $2$ is $2$ .

$f (2) = 10 - 1 \cdot 2$

Multiply $- 1$ by $2$ .

$f (2) = 10 - 2$

Subtract $2$ from $10$ .

$f (2) = 8$

The final answer is $8$ .

$y = 8$

The absolute value can be graphed using the points around the vertex $(0, 10), (- 2, 8), (- 1, 9), (1, 9), (2, 8)$

$\begin{array}{c} x & y \\ - 2 & 8 \\ - 1 & 9 \\ 0 & 10 \\ 1 & 9 \\ 2 & 8 \end{array}$

Step 4

Graph f(x)=10-|x|

Related Questions

Support LCMGCF.com by disabling your adblocker.