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Solution - Absolute value equations

Exact form:

w = - 1

w=-1

See steps

Step-by-step explanation

1. 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
$| 3 w + 8 | = | 3 w - 2 |$
without the absolute value bars:

$\| x \| = \| y \|$	$\| 3 w + 8 \| = \| 3 w - 2 \|$
$x = + y$	$(3 w + 8) = (3 w - 2)$
$x = - y$	$(3 w + 8) = - (3 w - 2)$
$+ x = y$	$(3 w + 8) = (3 w - 2)$
$- x = y$	$- (3 w + 8) = (3 w - 2)$

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:

$\| x \| = \| y \|$	$\| 3 w + 8 \| = \| 3 w - 2 \|$
$x = + y$ , $+ x = y$	$(3 w + 8) = (3 w - 2)$
$x = - y$ , $- x = y$	$(3 w + 8) = - (3 w - 2)$

2. Solve the two equations for w

5 additional steps

$(3 w + 8) = (3 w - 2)$

Subtract from both sides:

$(3 w + 8) - 3 w = (3 w - 2) - 3 w$

Group like terms:

$(3 w - 3 w) + 8 = (3 w - 2) - 3 w$

Simplify the arithmetic:

$8 = (3 w - 2) - 3 w$

Group like terms:

$8 = (3 w - 3 w) - 2$

Simplify the arithmetic:

$8 = - 2$

The statement is false:

$8 = - 2$

The equation is false so it has no solution.

11 additional steps

$(3 w + 8) = - (3 w - 2)$

Expand the parentheses:

$(3 w + 8) = - 3 w + 2$

Add to both sides:

$(3 w + 8) + 3 w = (- 3 w + 2) + 3 w$

Group like terms:

$(3 w + 3 w) + 8 = (- 3 w + 2) + 3 w$

Simplify the arithmetic:

$6 w + 8 = (- 3 w + 2) + 3 w$

Group like terms:

$6 w + 8 = (- 3 w + 3 w) + 2$

Simplify the arithmetic:

$6 w + 8 = 2$

Subtract from both sides:

$(6 w + 8) - 8 = 2 - 8$

Simplify the arithmetic:

$6 w = 2 - 8$

Simplify the arithmetic:

$6 w = - 6$

Divide both sides by :

$\frac{(6 w)}{6} = \frac{- 6}{6}$

Simplify the fraction:

$w = \frac{- 6}{6}$

Simplify the fraction:

$w = - 1$

3. Graph

Each line represents the function of one side of the equation:
$y = | 3 w + 8 |$
$y = | 3 w - 2 |$
The equation is true where the two lines cross.

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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 without absolute value bars

2. Solve the two equations for w

3. Graph

Why learn this

Terms and topics

Related links

Solution - Absolute value equations

Step-by-step explanation

1. Rewrite the equation without absolute value bars

2. Solve the two equations for w

3. Graph

Why learn this

Terms and topics

Related links

Latest Related Drills Solved