- Thread starter
- #1

#### karush

##### Well-known member

- Jan 31, 2012

- 2,715

**how do you create an abs equation like \(\displaystyle |x-4| \leq 10\)**

*from this*k

- Thread starter karush
- Start date

- Thread starter
- #1

- Jan 31, 2012

- 2,715

k

- Moderator
- #2

- Jan 26, 2012

- 995

Note that we can express the absolute value in terms of an inequality: $|y|\leq c \iff -c \leq y \leq c$.

how do you create an abs equation like \(\displaystyle |x-4| \leq 10\)from this

k

Now, note that if we subtract 4 from each piece of $-6\leq x\leq 14$, we get $-10\leq x-4 \leq 10$. Thus, by what I mentioned in the first line, this means that $|x-4|\leq 10$.

Does this clarify things?

[tex]a \le x \le b[/tex] converts to [tex]\left| {x - \frac{{a + b}}{2}} \right| \le \frac{{b - a}}{2}[/tex].if you are given \(\displaystyle -6 \leq x \leq 14\)

how do you create an abs equation like \(\displaystyle |x-4| \leq 10\)from this

Think of the mid-point of [tex][a,b][/tex] as well as the radius.