# Interval Notation

• April 18th 2010, 07:34 PM
mjfaris
Interval Notation
4. Solve the following equation and write your solution as a solution set.

3 + |7-4x| = 15

5. Solve the following inequality and write the solution set in interval notation.

|8x+2| < 14
• April 18th 2010, 10:19 PM
Amer
Quote:

Originally Posted by mjfaris
4. Solve the following equation and write your solution as a solution set.

3 + |7-4x| = 15

5. Solve the following inequality and write the solution set in interval notation.

|8x+2| < 14

3 + |7-4x| = 15
|7-4x| = 15 -3
|7-4x| = 12

so 7-4x = 12 or 7-4x = -12

x = -5/4 , x = 19/4

x ={-5/4,19/4}

the inequality

|8x+2| < 14

|x| < a that means -a< x < a

-14 < 8x+2 < 14

-16 < 8x < 12

-2 < x < 3/2

$x\in$(-2 , 3/2)