What is the solution set for absx < 15?

1 Answer
Aug 14, 2015

-15 < x < 15

Explanation:

All you really have to do to solve this absolute value inequality is to take into account the two possible signs x can have.

  • x>0 implies |x| = x

In this case, the inequality becomes

x < 15

  • x<0 implies |x| = -x

This time, you have

-x < 15 implies x > -15

So, the solution set to this inequality will include any value of x that simultaneously satisfies these conditions, x > -15 and x<15.

Therefore, the solution set will be -15 < x < 15, or x in (-15, 15).