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Solution - Absolute value equations

Exact form: x=-35,-1
x=-\frac{3}{5} , -1
Decimal form: x=0.6,1
x=-0.6 , -1

Other Ways to Solve

Absolute value equations

Step-by-step explanation

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

|4x+2|+|6x+4|=0

Add |6x+4| to both sides of the equation:

|4x+2|+|6x+4||6x+4|=|6x+4|

Simplify the arithmetic

|4x+2|=|6x+4|

2. Rewrite the equation without absolute value bars

Use the rules:
|x|=|y|x=±y and |x|=|y|±x=y
to write all four options of the equation
|4x+2|=|6x+4|
without the absolute value bars:

|x|=|y||4x+2|=|6x+4|
x=+y(4x+2)=(6x+4)
x=y(4x+2)=(6x+4)
+x=y(4x+2)=(6x+4)
x=y(4x+2)=(6x+4)

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||4x+2|=|6x+4|
x=+y , +x=y(4x+2)=(6x+4)
x=y , x=y(4x+2)=(6x+4)

3. Solve the two equations for x

12 additional steps

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

Expand the parentheses:

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

Add to both sides:

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

Group like terms:

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

Simplify the arithmetic:

10x+2=(-6x-4)+6x

Group like terms:

10x+2=(-6x+6x)-4

Simplify the arithmetic:

10x+2=4

Subtract from both sides:

(10x+2)-2=-4-2

Simplify the arithmetic:

10x=42

Simplify the arithmetic:

10x=6

Divide both sides by :

(10x)10=-610

Simplify the fraction:

x=-610

Find the greatest common factor of the numerator and denominator:

x=(-3·2)(5·2)

Factor out and cancel the greatest common factor:

x=-35

13 additional steps

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

NT_MSLUS_MAINSTEP_RESOLVE_DOUBLE_MINUS:

(4x+2)=6x+4

Subtract from both sides:

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

Group like terms:

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

Simplify the arithmetic:

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

Group like terms:

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

Simplify the arithmetic:

2x+2=4

Subtract from both sides:

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

Simplify the arithmetic:

2x=42

Simplify the arithmetic:

2x=2

Divide both sides by :

(-2x)-2=2-2

Cancel out the negatives:

2x2=2-2

Simplify the fraction:

x=2-2

Move the negative sign from the denominator to the numerator:

x=-22

Simplify the fraction:

x=1

4. List the solutions

x=-35,-1
(2 solution(s))

5. Graph

Each line represents the function of one side of the equation:
y=|4x+2|
y=|6x+4|
The equation is true where the two lines cross.

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.