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Solution - Absolute value equations

Exact form: x=2,0
x=-2 , 0

Other Ways to Solve

Absolute value equations

Step-by-step explanation

1. 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
|x2|=|3x+2|
without the absolute value bars:

|x|=|y||x2|=|3x+2|
x=+y(x2)=(3x+2)
x=y(x2)=(3x+2)
+x=y(x2)=(3x+2)
x=y(x2)=(3x+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||x2|=|3x+2|
x=+y , +x=y(x2)=(3x+2)
x=y , x=y(x2)=(3x+2)

2. Solve the two equations for x

13 additional steps

(x-2)=(3x+2)

Subtract from both sides:

(x-2)-3x=(3x+2)-3x

Group like terms:

(x-3x)-2=(3x+2)-3x

Simplify the arithmetic:

-2x-2=(3x+2)-3x

Group like terms:

-2x-2=(3x-3x)+2

Simplify the arithmetic:

2x2=2

Add to both sides:

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

Simplify the arithmetic:

2x=2+2

Simplify the arithmetic:

2x=4

Divide both sides by :

(-2x)-2=4-2

Cancel out the negatives:

2x2=4-2

Simplify the fraction:

x=4-2

Move the negative sign from the denominator to the numerator:

x=-42

Find the greatest common factor of the numerator and denominator:

x=(-2·2)(1·2)

Factor out and cancel the greatest common factor:

x=2

9 additional steps

(x-2)=-(3x+2)

Expand the parentheses:

(x-2)=-3x-2

Add to both sides:

(x-2)+3x=(-3x-2)+3x

Group like terms:

(x+3x)-2=(-3x-2)+3x

Simplify the arithmetic:

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

Group like terms:

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

Simplify the arithmetic:

4x2=2

Add to both sides:

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

Simplify the arithmetic:

4x=2+2

Simplify the arithmetic:

4x=0

Divide both sides by the coefficient:

x=0

3. List the solutions

x=2,0
(2 solution(s))

4. Graph

Each line represents the function of one side of the equation:
y=|x2|
y=|3x+2|
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.