Enter an equation or problem

Camera input is not recognized!

Solution - Absolute value equations

Exact form:

x = - 9, - \frac{1}{5}

x=-9 , -\frac{1}{5}

Decimal form:

x = - 9, - 0.2

x=-9 , -0.2

See steps

Step-by-step explanation

1. Rewrite the equation with one absolute value terms on each side

$| 2 x - 4 | - | 3 x + 5 | = 0$

Add $| 3 x + 5 |$ to both sides of the equation:

$| 2 x - 4 | - | 3 x + 5 | + | 3 x + 5 | = | 3 x + 5 |$

Simplify the arithmetic

$| 2 x - 4 | = | 3 x + 5 |$

2. Rewrite the equation without absolute value bars

Use the rules:
$| x | = | y |$ → $x = \pm y$ and $| x | = | y |$ → $\pm x = y$
to write all four options of the equation
$| 2 x - 4 | = | 3 x + 5 |$
without the absolute value bars:

$\| x \| = \| y \|$	$\| 2 x - 4 \| = \| 3 x + 5 \|$
$x = + y$	$(2 x - 4) = (3 x + 5)$
$x = - y$	$(2 x - 4) = (- (3 x + 5))$
$+ x = y$	$(2 x - 4) = (3 x + 5)$
$- x = y$	$- (2 x - 4) = (3 x + 5)$

When simplified, equations $x = + y$ and $+ x = y$ are the same and equations $x = - y$ and $- x = y$ are the same, so we end up with only 2 equations:

$\| x \| = \| y \|$	$\| 2 x - 4 \| = \| 3 x + 5 \|$
$x = + y$ , $+ x = y$	$(2 x - 4) = (3 x + 5)$
$x = - y$ , $- x = y$	$(2 x - 4) = (- (3 x + 5))$

3. Solve the two equations for x

10 additional steps

$(2 x - 4) = (3 x + 5)$

Subtract from both sides:

$(2 x - 4) - 3 x = (3 x + 5) - 3 x$

Group like terms:

$(2 x - 3 x) - 4 = (3 x + 5) - 3 x$

Simplify the arithmetic:

$- x - 4 = (3 x + 5) - 3 x$

Group like terms:

$- x - 4 = (3 x - 3 x) + 5$

Simplify the arithmetic:

$- x - 4 = 5$

Add to both sides:

$(- x - 4) + 4 = 5 + 4$

Simplify the arithmetic:

$- x = 5 + 4$

Simplify the arithmetic:

$- x = 9$

Multiply both sides by :

$- x \cdot - 1 = 9 \cdot - 1$

Remove the one(s):

$x = 9 \cdot - 1$

Simplify the arithmetic:

$x = - 9$

10 additional steps

$(2 x - 4) = - (3 x + 5)$

Expand the parentheses:

$(2 x - 4) = - 3 x - 5$

Add to both sides:

$(2 x - 4) + 3 x = (- 3 x - 5) + 3 x$

Group like terms:

$(2 x + 3 x) - 4 = (- 3 x - 5) + 3 x$

Simplify the arithmetic:

$5 x - 4 = (- 3 x - 5) + 3 x$

Group like terms:

$5 x - 4 = (- 3 x + 3 x) - 5$

Simplify the arithmetic:

$5 x - 4 = - 5$

Add to both sides:

$(5 x - 4) + 4 = - 5 + 4$

Simplify the arithmetic:

$5 x = - 5 + 4$

Simplify the arithmetic:

$5 x = - 1$

Divide both sides by :

$\frac{(5 x)}{5} = \frac{- 1}{5}$

Simplify the fraction:

$x = \frac{- 1}{5}$

4. List the solutions

$x = - 9, - \frac{1}{5}$
(2 solution(s))

5. Graph

Each line represents the function of one side of the equation:
$y = | 2 x - 4 |$
$y = | 3 x + 5 |$
The equation is true where the two lines cross.

How did we do?

Please leave us feedback.

Why learn this

We encounter absolute values almost daily. For example: If you walk 3 miles to school, do you also walk minus 3 miles when you go back home? The answer is no because distances use absolute value. The absolute value of the distance between home and school is 3 miles, there or back.
In short, absolute values help us deal with concepts like distance, ranges of possible values, and deviation from a set value.

Solution - Absolute value equations

Step-by-step explanation

1. Rewrite the equation with one absolute value terms on each side

2. Rewrite the equation without absolute value bars

3. Solve the two equations for x

4. List the solutions

5. Graph

Why learn this

Terms and topics

Related links

Solution - Absolute value equations

Step-by-step explanation

1. Rewrite the equation with one absolute value terms on each side

2. Rewrite the equation without absolute value bars

3. Solve the two equations for x

4. List the solutions

5. Graph

Why learn this

Terms and topics

Related links

Latest Related Drills Solved