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Penyelesaian - Absolute value equations

Hasil Akhir Langkah-langkah Terma dan topik

Exact form:

x = 13

x=13

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
$| x - 9 | = | - x + 17 |$
without the absolute value bars:

$\| x \| = \| y \|$	$\| x - 9 \| = \| - x + 17 \|$
$x = + y$	$(x - 9) = (- x + 17)$
$x = - y$	$(x - 9) = - (- x + 17)$
$+ x = y$	$(x - 9) = (- x + 17)$
$- x = y$	$- (x - 9) = (- x + 17)$

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:

$\| x \| = \| y \|$	$\| x - 9 \| = \| - x + 17 \|$
$x = + y$ , $+ x = y$	$(x - 9) = (- x + 17)$
$x = - y$ , $- x = y$	$(x - 9) = - (- x + 17)$

2. Solve the two equations for x

11 additional steps

$(x - 9) = (- x + 17)$

Add to both sides:

$(x - 9) + x = (- x + 17) + x$

Kumpulkan sebutan sejenis:

$(x + x) - 9 = (- x + 17) + x$

Permudahkan aritmetik:

$2 x - 9 = (- x + 17) + x$

Kumpulkan sebutan sejenis:

$2 x - 9 = (- x + x) + 17$

Permudahkan aritmetik:

$2 x - 9 = 17$

Add to both sides:

$(2 x - 9) + 9 = 17 + 9$

Permudahkan aritmetik:

$2 x = 17 + 9$

Permudahkan aritmetik:

$2 x = 26$

Divide both sides by :

$\frac{(2 x)}{2} = \frac{26}{2}$

Permudahkan pecahan:

$x = \frac{26}{2}$

Cari faktor sepunya terbesar bagi pembilang dan penyebut:

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

Faktorkan keluar dan hapuskan faktor sepunya terbesar:

$x = 13$

6 additional steps

$(x - 9) = - (- x + 17)$

Expand the parentheses:

$(x - 9) = x - 17$

Subtract from both sides:

$(x - 9) - x = (x - 17) - x$

Kumpulkan sebutan sejenis:

$(x - x) - 9 = (x - 17) - x$

Permudahkan aritmetik:

$- 9 = (x - 17) - x$

Kumpulkan sebutan sejenis:

$- 9 = (x - x) - 17$

Permudahkan aritmetik:

$- 9 = - 17$

Pernyataan ini palsu:

$- 9 = - 17$

The equation is false so it has no solution.

3. List the solutions

$x = 13$
(1 solution(s))

4. Graph

Each line represents the function of one side of the equation:
$y = | x - 9 |$
$y = | - x + 17 |$
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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