Convert to Interval Notation -7|x-6|>-56

$- 7 | x - 6 | > - 56$

Step 1

Divide each term in $- 7 | x - 6 | > - 56$ by $- 7$ and simplify.

Divide each term in $- 7 | x - 6 | > - 56$ by $- 7$ . When multiplying or dividing both sides of an inequality by a negative value, flip the direction of the inequality sign.

$\frac{- 7 | x - 6 |}{- 7} < \frac{- 56}{- 7}$

Simplify the left side.

Cancel the common factor of $- 7$ .

Cancel the common factor.

$\frac{- 7 | x - 6 |}{- 7} < \frac{- 56}{- 7}$

Divide $| x - 6 |$ by $1$ .

$| x - 6 | < \frac{- 56}{- 7}$

Simplify the right side.

Divide $- 56$ by $- 7$ .

$| x - 6 | < 8$

Step 2

Write $| x - 6 | < 8$ as a piecewise.

To find the interval for the first piece, find where the inside of the absolute value is non-negative.

$x - 6 \geq 0$

Add $6$ to both sides of the inequality.

$x \geq 6$

In the piece where $x - 6$ is non-negative, remove the absolute value.

$x - 6 < 8$

To find the interval for the second piece, find where the inside of the absolute value is negative.

$x - 6 < 0$

Add $6$ to both sides of the inequality.

$x < 6$

In the piece where $x - 6$ is negative, remove the absolute value and multiply by $- 1$ .

$- (x - 6) < 8$

Write as a piecewise.

${\begin{cases} x - 6 < 8 & x \geq 6 \\ - (x - 6) < 8 & x < 6 \end{cases}$

Simplify $- (x - 6) < 8$ .

Apply the distributive property.

${\begin{cases} x - 6 < 8 & x \geq 6 \\ - x - - 6 < 8 & x < 6 \end{cases}$

Multiply $- 1$ by $- 6$ .

${\begin{cases} x - 6 < 8 & x \geq 6 \\ - x + 6 < 8 & x < 6 \end{cases}$

Step 3

Solve $x - 6 < 8$ when $x \geq 6$ .

Move all terms not containing $x$ to the right side of the inequality.

Add $6$ to both sides of the inequality.

$x < 8 + 6$

Add $8$ and $6$ .

$x < 14$

Find the intersection of $x < 14$ and $x \geq 6$ .

$6 \leq x < 14$

Step 4

Solve $- x + 6 < 8$ when $x < 6$ .

Solve $- x + 6 < 8$ for $x$ .

Move all terms not containing $x$ to the right side of the inequality.

Subtract $6$ from both sides of the inequality.

$- x < 8 - 6$

Subtract $6$ from $8$ .

$- x < 2$

Divide each term in $- x < 2$ by $- 1$ and simplify.

Divide each term in $- x < 2$ by $- 1$ . When multiplying or dividing both sides of an inequality by a negative value, flip the direction of the inequality sign.

$\frac{- x}{- 1} > \frac{2}{- 1}$

Simplify the left side.

Dividing two negative values results in a positive value.

$\frac{x}{1} > \frac{2}{- 1}$

Divide $x$ by $1$ .

$x > \frac{2}{- 1}$

Simplify the right side.

Divide $2$ by $- 1$ .

$x > - 2$

Find the intersection of $x > - 2$ and $x < 6$ .

$- 2 < x < 6$

Step 5

Find the union of the solutions.

$- 2 < x < 14$

Step 6

Convert the inequality to interval notation.

$(- 2, 14)$

Step 7

Convert to Interval Notation -7|x-6|>-56

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