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Solution - Absolute value equations

Exact form:

b = - 1, 4

b=-1 , 4

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
$- | b + 6 | = | 3 b - 2 |$
without the absolute value bars:

$\| x \| = \| y \|$	$- \| b + 6 \| = \| 3 b - 2 \|$
$x = + y$	$- (b + 6) = (3 b - 2)$
$x = - y$	$- (b + 6) = - (3 b - 2)$
$+ x = y$	$- (b + 6) = (3 b - 2)$
$- x = y$	$- (- (b + 6)) = (3 b - 2)$

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:

$\| x \| = \| y \|$	$- \| b + 6 \| = \| 3 b - 2 \|$
$x = + y$ , $+ x = y$	$- (b + 6) = (3 b - 2)$
$x = - y$ , $- x = y$	$- (b + 6) = - (3 b - 2)$

2. Solve the two equations for b

13 additional steps

$- (b + 6) = (3 b - 2)$

Expand the parentheses:

$- b - 6 = (3 b - 2)$

Subtract from both sides:

$(- b - 6) - 3 b = (3 b - 2) - 3 b$

Group like terms:

$(- b - 3 b) - 6 = (3 b - 2) - 3 b$

Simplify the arithmetic:

$- 4 b - 6 = (3 b - 2) - 3 b$

Group like terms:

$- 4 b - 6 = (3 b - 3 b) - 2$

Simplify the arithmetic:

$- 4 b - 6 = - 2$

Add to both sides:

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

Simplify the arithmetic:

$- 4 b = - 2 + 6$

Simplify the arithmetic:

$- 4 b = 4$

Divide both sides by :

$\frac{(- 4 b)}{- 4} = \frac{4}{- 4}$

Cancel out the negatives:

$\frac{4 b}{4} = \frac{4}{- 4}$

Simplify the fraction:

$b = \frac{4}{- 4}$

Move the negative sign from the denominator to the numerator:

$b = \frac{- 4}{4}$

Simplify the fraction:

$b = - 1$

13 additional steps

$- (b + 6) = - (3 b - 2)$

Expand the parentheses:

$- b - 6 = - (3 b - 2)$

Expand the parentheses:

$- b - 6 = - 3 b + 2$

Add to both sides:

$(- b - 6) + 3 b = (- 3 b + 2) + 3 b$

Group like terms:

$(- b + 3 b) - 6 = (- 3 b + 2) + 3 b$

Simplify the arithmetic:

$2 b - 6 = (- 3 b + 2) + 3 b$

Group like terms:

$2 b - 6 = (- 3 b + 3 b) + 2$

Simplify the arithmetic:

$2 b - 6 = 2$

Add to both sides:

$(2 b - 6) + 6 = 2 + 6$

Simplify the arithmetic:

$2 b = 2 + 6$

Simplify the arithmetic:

$2 b = 8$

Divide both sides by :

$\frac{(2 b)}{2} = \frac{8}{2}$

Simplify the fraction:

$b = \frac{8}{2}$

Find the greatest common factor of the numerator and denominator:

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

Factor out and cancel the greatest common factor:

$b = 4$

3. List the solutions

$b = - 1, 4$
(2 solution(s))

4. Graph

Each line represents the function of one side of the equation:
$y = - | b + 6 |$
$y = | 3 b - 2 |$
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 b

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 b

3. List the solutions

4. Graph

Why learn this

Terms and topics

Related links

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