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Penyelesaian - Absolute value equations

Hasil Akhir Langkah-langkah Terma dan topik

Exact form:

w = - 26, - \frac{2}{3}

w=-26 , -\frac{2}{3}

Decimal form:

w = - 26, - 0.667

w=-26 , -0.667

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
$| \frac{1}{2} w - 6 | = | w + 7 |$
without the absolute value bars:

$\| x \| = \| y \|$	$\| \frac{1}{2} w - 6 \| = \| w + 7 \|$
$x = + y$	$(\frac{1}{2} w - 6) = (w + 7)$
$x = - y$	$(\frac{1}{2} w - 6) = - (w + 7)$
$+ x = y$	$(\frac{1}{2} w - 6) = (w + 7)$
$- x = y$	$- (\frac{1}{2} w - 6) = (w + 7)$

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:

$\| x \| = \| y \|$	$\| \frac{1}{2} w - 6 \| = \| w + 7 \|$
$x = + y$ , $+ x = y$	$(\frac{1}{2} w - 6) = (w + 7)$
$x = - y$ , $- x = y$	$(\frac{1}{2} w - 6) = - (w + 7)$

2. Solve the two equations for w

16 additional steps

$(\frac{1}{2} w - 6) = (w + 7)$

Subtract from both sides:

$(\frac{1}{2} w - 6) - w = (w + 7) - w$

Kumpulkan sebutan sejenis:

$(\frac{1}{2} w - w) - 6 = (w + 7) - w$

Kumpulkan pekali:

$(\frac{1}{2} - 1) w - 6 = (w + 7) - w$

Tukar nombor bulat kepada pecahan:

$(\frac{1}{2} + \frac{- 2}{2}) w - 6 = (w + 7) - w$

Gabungkan pecahan:

$\frac{(1 - 2)}{2} w - 6 = (w + 7) - w$

Gabungkan pembilang:

$\frac{- 1}{2} w - 6 = (w + 7) - w$

Kumpulkan sebutan sejenis:

$\frac{- 1}{2} w - 6 = (w - w) + 7$

Permudahkan aritmetik:

$\frac{- 1}{2} w - 6 = 7$

Add to both sides:

$(\frac{- 1}{2} w - 6) + 6 = 7 + 6$

Permudahkan aritmetik:

$\frac{- 1}{2} w = 7 + 6$

Permudahkan aritmetik:

$\frac{- 1}{2} w = 13$

Multiply both sides by inverse fraction :

$(\frac{- 1}{2} w) \cdot \frac{2}{- 1} = 13 \cdot \frac{2}{- 1}$

Kumpulkan sebutan sejenis:

$(\frac{- 1}{2} \cdot - 2) w = 13 \cdot \frac{2}{- 1}$

Darabkan pekali:

$\frac{(- 1 \cdot - 2)}{2} w = 13 \cdot \frac{2}{- 1}$

Permudahkan aritmetik:

$1 w = 13 \cdot \frac{2}{- 1}$

$w = 13 \cdot \frac{2}{- 1}$

Permudahkan aritmetik:

$w = - 26$

16 additional steps

$(\frac{1}{2} w - 6) = - (w + 7)$

Expand the parentheses:

$(\frac{1}{2} w - 6) = - w - 7$

Add to both sides:

$(\frac{1}{2} w - 6) + w = (- w - 7) + w$

Kumpulkan sebutan sejenis:

$(\frac{1}{2} w + w) - 6 = (- w - 7) + w$

Kumpulkan pekali:

$(\frac{1}{2} + 1) w - 6 = (- w - 7) + w$

Tukar nombor bulat kepada pecahan:

$(\frac{1}{2} + \frac{2}{2}) w - 6 = (- w - 7) + w$

Gabungkan pecahan:

$\frac{(1 + 2)}{2} w - 6 = (- w - 7) + w$

Gabungkan pembilang:

$\frac{3}{2} w - 6 = (- w - 7) + w$

Kumpulkan sebutan sejenis:

$\frac{3}{2} w - 6 = (- w + w) - 7$

Permudahkan aritmetik:

$\frac{3}{2} w - 6 = - 7$

Add to both sides:

$(\frac{3}{2} w - 6) + 6 = - 7 + 6$

Permudahkan aritmetik:

$\frac{3}{2} w = - 7 + 6$

Permudahkan aritmetik:

$\frac{3}{2} w = - 1$

Multiply both sides by inverse fraction :

$(\frac{3}{2} w) \cdot \frac{2}{3} = - 1 \cdot \frac{2}{3}$

Kumpulkan sebutan sejenis:

$(\frac{3}{2} \cdot \frac{2}{3}) w = - 1 \cdot \frac{2}{3}$

Darabkan pekali:

$\frac{(3 \cdot 2)}{(2 \cdot 3)} w = - 1 \cdot \frac{2}{3}$

Permudahkan pecahan:

$w = - 1 \cdot \frac{2}{3}$

Buang nilai satu:

$w = \frac{- 2}{3}$

3. List the solutions

$w = - 26, - \frac{2}{3}$
(2 solution(s))

4. Graph

Each line represents the function of one side of the equation:
$y = | \frac{1}{2} w - 6 |$
$y = | w + 7 |$
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 w

3. List the solutions

4. Graph

Mengapa belajar ini

Terma dan topik

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