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Penyelesaian - Absolute value equations

Hasil Akhir Langkah-langkah Terma dan topik

Exact form:

x = 3, \frac{4}{3}

x=3 , \frac{4}{3}

Mixed number form:

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

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

Decimal form:

x = 3, 1.333

x=3 , 1.333

Lihat langkah Learn more with Tiger Try this:

Penjelasan langkah demi langkah

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
$| x + 2 | = 5 | x - 2 |$
without the absolute value bars:

$\| x \| = \| y \|$	$\| x + 2 \| = 5 \| x - 2 \|$
$x = + y$	$(x + 2) = 5 (x - 2)$
$x = - y$	$(x + 2) = 5 (- (x - 2))$
$+ x = y$	$(x + 2) = 5 (x - 2)$
$- x = y$	$- (x + 2) = 5 (x - 2)$

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:

$\| x \| = \| y \|$	$\| x + 2 \| = 5 \| x - 2 \|$
$x = + y$ , $+ x = y$	$(x + 2) = 5 (x - 2)$
$x = - y$ , $- x = y$	$(x + 2) = 5 (- (x - 2))$

2. Solve the two equations for x

15 additional steps

$(x + 2) = 5 \cdot (x - 2)$

Expand the parentheses:

$(x + 2) = 5 x + 5 \cdot - 2$

Permudahkan aritmetik:

$(x + 2) = 5 x - 10$

Subtract from both sides:

$(x + 2) - 5 x = (5 x - 10) - 5 x$

Kumpulkan sebutan sejenis:

$(x - 5 x) + 2 = (5 x - 10) - 5 x$

Permudahkan aritmetik:

$- 4 x + 2 = (5 x - 10) - 5 x$

Kumpulkan sebutan sejenis:

$- 4 x + 2 = (5 x - 5 x) - 10$

Permudahkan aritmetik:

$- 4 x + 2 = - 10$

Subtract from both sides:

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

Permudahkan aritmetik:

$- 4 x = - 10 - 2$

Permudahkan aritmetik:

$- 4 x = - 12$

Divide both sides by :

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

Hapuskan tanda negatif:

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

Permudahkan pecahan:

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

Hapuskan tanda negatif:

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

Cari faktor sepunya terbesar bagi pembilang dan penyebut:

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

Faktorkan keluar dan hapuskan faktor sepunya terbesar:

$x = 3$

16 additional steps

$(x + 2) = 5 \cdot (- (x - 2))$

Expand the parentheses:

$(x + 2) = 5 \cdot (- x + 2)$

$(x + 2) = 5 \cdot - x + 5 \cdot 2$

Kumpulkan sebutan sejenis:

$(x + 2) = (5 \cdot - 1) x + 5 \cdot 2$

Darabkan pekali:

$(x + 2) = - 5 x + 5 \cdot 2$

Permudahkan aritmetik:

$(x + 2) = - 5 x + 10$

Add to both sides:

$(x + 2) + 5 x = (- 5 x + 10) + 5 x$

Kumpulkan sebutan sejenis:

$(x + 5 x) + 2 = (- 5 x + 10) + 5 x$

Permudahkan aritmetik:

$6 x + 2 = (- 5 x + 10) + 5 x$

Kumpulkan sebutan sejenis:

$6 x + 2 = (- 5 x + 5 x) + 10$

Permudahkan aritmetik:

$6 x + 2 = 10$

Subtract from both sides:

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

Permudahkan aritmetik:

$6 x = 10 - 2$

Permudahkan aritmetik:

$6 x = 8$

Divide both sides by :

$\frac{(6 x)}{6} = \frac{8}{6}$

Permudahkan pecahan:

$x = \frac{8}{6}$

Cari faktor sepunya terbesar bagi pembilang dan penyebut:

$x = \frac{(4 \cdot 2)}{(3 \cdot 2)}$

Faktorkan keluar dan hapuskan faktor sepunya terbesar:

$x = \frac{4}{3}$

3. List the solutions

$x = 3, \frac{4}{3}$
(2 solution(s))

4. Graph

Each line represents the function of one side of the equation:
$y = | x + 2 |$
$y = 5 | x - 2 |$
The equation is true where the two lines cross.

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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.

Penyelesaian - Absolute value equations

Penjelasan langkah demi langkah

1. Rewrite the equation without absolute value bars

2. Solve the two equations for x

3. List the solutions

4. Graph

Mengapa belajar ini

Terma dan topik

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