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Penyelesaian - Absolute value equations

Exact form: x=0,9
x=0 , -9

Other Ways to Solve

Absolute value equations

Penjelasan langkah demi langkah

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

|x9|+3|x+3|=0

Add 3|x+3| to both sides of the equation:

|x9|+3|x+3|3|x+3|=3|x+3|

Permudahkan aritmetik

|x9|=3|x+3|

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
|x9|=3|x+3|
without the absolute value bars:

|x|=|y||x9|=3|x+3|
x=+y(x9)=3(x+3)
x=y(x9)=3((x+3))
+x=y(x9)=3(x+3)
x=y(x9)=3(x+3)

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||x9|=3|x+3|
x=+y , +x=y(x9)=3(x+3)
x=y , x=y(x9)=3((x+3))

3. Solve the two equations for x

10 additional steps

(x-9)=-3·(x+3)

Expand the parentheses:

(x-9)=-3x-3·3

Permudahkan aritmetik:

(x-9)=-3x-9

Add to both sides:

(x-9)+3x=(-3x-9)+3x

Kumpulkan sebutan sejenis:

(x+3x)-9=(-3x-9)+3x

Permudahkan aritmetik:

4x-9=(-3x-9)+3x

Kumpulkan sebutan sejenis:

4x-9=(-3x+3x)-9

Permudahkan aritmetik:

4x9=9

Add to both sides:

(4x-9)+9=-9+9

Permudahkan aritmetik:

4x=9+9

Permudahkan aritmetik:

4x=0

Divide both sides by the coefficient:

x=0

18 additional steps

(x-9)=-3·(-(x+3))

Expand the parentheses:

(x-9)=-3·(-x-3)

(x-9)=-3·-x-3·-3

Kumpulkan sebutan sejenis:

(x-9)=(-3·-1)x-3·-3

Darabkan pekali:

(x-9)=3x-3·-3

Permudahkan aritmetik:

(x-9)=3x+9

Subtract from both sides:

(x-9)-3x=(3x+9)-3x

Kumpulkan sebutan sejenis:

(x-3x)-9=(3x+9)-3x

Permudahkan aritmetik:

-2x-9=(3x+9)-3x

Kumpulkan sebutan sejenis:

-2x-9=(3x-3x)+9

Permudahkan aritmetik:

2x9=9

Add to both sides:

(-2x-9)+9=9+9

Permudahkan aritmetik:

2x=9+9

Permudahkan aritmetik:

2x=18

Divide both sides by :

(-2x)-2=18-2

Hapuskan tanda negatif:

2x2=18-2

Permudahkan pecahan:

x=18-2

Pindahkan tanda negatif dari penyebut ke pembilang:

x=-182

Cari faktor sepunya terbesar bagi pembilang dan penyebut:

x=(-9·2)(1·2)

Faktorkan keluar dan hapuskan faktor sepunya terbesar:

x=9

4. List the solutions

x=0,9
(2 solution(s))

5. Graph

Each line represents the function of one side of the equation:
y=|x9|
y=3|x+3|
The equation is true where the two lines cross.

Mengapa belajar ini

Learn more with Tiger

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.