Finite Math Examples

$f (x) = | x + 2 |$

Step 1

Find the x-intercepts.

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Step 1.1

To find the x-intercept(s), substitute in $0$ for $y$ and solve for $x$ .

$0 = | x + 2 |$

Step 1.2

Solve the equation.

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Step 1.2.1

Rewrite the equation as $| x + 2 | = 0$ .

$| x + 2 | = 0$

Step 1.2.2

Remove the absolute value term. This creates a $\pm$ on the right side of the equation because $| x | = \pm x$ .

$x + 2 = \pm 0$

Step 1.2.3

Plus or minus $0$ is $0$ .

$x + 2 = 0$

Step 1.2.4

Subtract $2$ from both sides of the equation.

$x = - 2$

Step 1.2.5

Remove the absolute value term. This creates a $\pm$ on the right side of the equation because $| x | = \pm x$ .

$x + 2 = \pm 0$

Step 1.2.6

Plus or minus $0$ is $0$ .

$x + 2 = 0$

Step 1.2.7

Subtract $2$ from both sides of the equation.

$x = - 2$

Step 1.3

x-intercept(s) in point form.

x-intercept(s): $(- 2, 0)$

Step 2

Find the y-intercepts.

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Step 2.1

To find the y-intercept(s), substitute in $0$ for $x$ and solve for $y$ .

$y = | (0) + 2 |$

Step 2.2

Simplify $| (0) + 2 |$ .

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Step 2.2.1

Add $0$ and $2$ .

$y = | 2 |$

Step 2.2.2

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

$y = 2$

Step 2.3

y-intercept(s) in point form.

y-intercept(s): $(0, 2)$

Step 3

List the intersections.

x-intercept(s): $(- 2, 0)$

y-intercept(s): $(0, 2)$

Step 4