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Penyelesaian - Absolute value equations

Hasil Akhir Langkah-langkah Terma dan topik

Exact form:

x = 1, \frac{1}{6}

x=1 , \frac{1}{6}

Decimal form:

x = 1, 0.167

x=1 , 0.167

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
$| 4 x + 1 | = | 8 x - 3 |$
without the absolute value bars:

$\| x \| = \| y \|$	$\| 4 x + 1 \| = \| 8 x - 3 \|$
$x = + y$	$(4 x + 1) = (8 x - 3)$
$x = - y$	$(4 x + 1) = - (8 x - 3)$
$+ x = y$	$(4 x + 1) = (8 x - 3)$
$- x = y$	$- (4 x + 1) = (8 x - 3)$

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:

$\| x \| = \| y \|$	$\| 4 x + 1 \| = \| 8 x - 3 \|$
$x = + y$ , $+ x = y$	$(4 x + 1) = (8 x - 3)$
$x = - y$ , $- x = y$	$(4 x + 1) = - (8 x - 3)$

2. Solve the two equations for x

12 additional steps

$(4 x + 1) = (8 x - 3)$

Subtract from both sides:

$(4 x + 1) - 8 x = (8 x - 3) - 8 x$

Kumpulkan sebutan sejenis:

$(4 x - 8 x) + 1 = (8 x - 3) - 8 x$

Permudahkan aritmetik:

$- 4 x + 1 = (8 x - 3) - 8 x$

Kumpulkan sebutan sejenis:

$- 4 x + 1 = (8 x - 8 x) - 3$

Permudahkan aritmetik:

$- 4 x + 1 = - 3$

Subtract from both sides:

$(- 4 x + 1) - 1 = - 3 - 1$

Permudahkan aritmetik:

$- 4 x = - 3 - 1$

Permudahkan aritmetik:

$- 4 x = - 4$

Divide both sides by :

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

Hapuskan tanda negatif:

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

Permudahkan pecahan:

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

Hapuskan tanda negatif:

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

Permudahkan pecahan:

$x = 1$

12 additional steps

$(4 x + 1) = - (8 x - 3)$

Expand the parentheses:

$(4 x + 1) = - 8 x + 3$

Add to both sides:

$(4 x + 1) + 8 x = (- 8 x + 3) + 8 x$

Kumpulkan sebutan sejenis:

$(4 x + 8 x) + 1 = (- 8 x + 3) + 8 x$

Permudahkan aritmetik:

$12 x + 1 = (- 8 x + 3) + 8 x$

Kumpulkan sebutan sejenis:

$12 x + 1 = (- 8 x + 8 x) + 3$

Permudahkan aritmetik:

$12 x + 1 = 3$

Subtract from both sides:

$(12 x + 1) - 1 = 3 - 1$

Permudahkan aritmetik:

$12 x = 3 - 1$

Permudahkan aritmetik:

$12 x = 2$

Divide both sides by :

$\frac{(12 x)}{12} = \frac{2}{12}$

Permudahkan pecahan:

$x = \frac{2}{12}$

Cari faktor sepunya terbesar bagi pembilang dan penyebut:

$x = \frac{(1 \cdot 2)}{(6 \cdot 2)}$

Faktorkan keluar dan hapuskan faktor sepunya terbesar:

$x = \frac{1}{6}$

3. List the solutions

$x = 1, \frac{1}{6}$
(2 solution(s))

4. Graph

Each line represents the function of one side of the equation:
$y = | 4 x + 1 |$
$y = | 8 x - 3 |$
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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