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Solution - Absolute value equations

Exact form:

x = - \frac{1}{3}, - 2

x=-\frac{1}{3} , -2

Decimal form:

x = - 0.333, - 2

x=-0.333 , -2

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
$| 8 x + 6 | = | - 4 x + 2 |$
without the absolute value bars:

$\| x \| = \| y \|$	$\| 8 x + 6 \| = \| - 4 x + 2 \|$
$x = + y$	$(8 x + 6) = (- 4 x + 2)$
$x = - y$	$(8 x + 6) = - (- 4 x + 2)$
$+ x = y$	$(8 x + 6) = (- 4 x + 2)$
$- x = y$	$- (8 x + 6) = (- 4 x + 2)$

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:

$\| x \| = \| y \|$	$\| 8 x + 6 \| = \| - 4 x + 2 \|$
$x = + y$ , $+ x = y$	$(8 x + 6) = (- 4 x + 2)$
$x = - y$ , $- x = y$	$(8 x + 6) = - (- 4 x + 2)$

2. Solve the two equations for x

11 additional steps

$(8 x + 6) = (- 4 x + 2)$

Add to both sides:

$(8 x + 6) + 4 x = (- 4 x + 2) + 4 x$

Group like terms:

$(8 x + 4 x) + 6 = (- 4 x + 2) + 4 x$

Simplify the arithmetic:

$12 x + 6 = (- 4 x + 2) + 4 x$

Group like terms:

$12 x + 6 = (- 4 x + 4 x) + 2$

Simplify the arithmetic:

$12 x + 6 = 2$

Subtract from both sides:

$(12 x + 6) - 6 = 2 - 6$

Simplify the arithmetic:

$12 x = 2 - 6$

Simplify the arithmetic:

$12 x = - 4$

Divide both sides by :

$\frac{(12 x)}{12} = \frac{- 4}{12}$

Simplify the fraction:

$x = \frac{- 4}{12}$

Find the greatest common factor of the numerator and denominator:

$x = \frac{(- 1 \cdot 4)}{(3 \cdot 4)}$

Factor out and cancel the greatest common factor:

$x = \frac{- 1}{3}$

12 additional steps

$(8 x + 6) = - (- 4 x + 2)$

Expand the parentheses:

$(8 x + 6) = 4 x - 2$

Subtract from both sides:

$(8 x + 6) - 4 x = (4 x - 2) - 4 x$

Group like terms:

$(8 x - 4 x) + 6 = (4 x - 2) - 4 x$

Simplify the arithmetic:

$4 x + 6 = (4 x - 2) - 4 x$

Group like terms:

$4 x + 6 = (4 x - 4 x) - 2$

Simplify the arithmetic:

$4 x + 6 = - 2$

Subtract from both sides:

$(4 x + 6) - 6 = - 2 - 6$

Simplify the arithmetic:

$4 x = - 2 - 6$

Simplify the arithmetic:

$4 x = - 8$

Divide both sides by :

$\frac{(4 x)}{4} = \frac{- 8}{4}$

Simplify the fraction:

$x = \frac{- 8}{4}$

Find the greatest common factor of the numerator and denominator:

$x = \frac{(- 2 \cdot 4)}{(1 \cdot 4)}$

Factor out and cancel the greatest common factor:

$x = - 2$

3. List the solutions

$x = - \frac{1}{3}, - 2$
(2 solution(s))

4. Graph

Each line represents the function of one side of the equation:
$y = | 8 x + 6 |$
$y = | - 4 x + 2 |$
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 x

3. List the solutions

4. 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 x

3. List the solutions

4. Graph

Why learn this

Terms and topics

Related links

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