The absolute value of a number is the distance between the number and zero on the number line. Opposites are numbers that have the same absolute value, for example (5, and -5). When we solve an absolute value equation such as |x| = 5, there are two solutions: x = 5 or x = -5.

Test Objectives
• Demonstrate a general understanding of absolute value
• Demonstrate the ability to solve a compound equation with "or"
• Demonstrate the ability to solve an absolute value equation
Solving Absolute Value Equations Practice Test:

#1:

Instructions: Solve each equation.

a) -9|8 + 6x| - 7 = -25

#2:

Instructions: Solve each equation.

a) -10|5n + 6| - 5 = -5

#3:

Instructions: Solve each equation.

a) 3|-10 + 5p| + 1 = 106

#4:

Instructions: Solve each equation.

a) 5 + 9|5p - 4| = -31

#5:

Instructions: Solve each equation.

a) |x + 4| = |5x + 8|

Written Solutions:

#1:

Solutions:

a) $$x=-1$$ or $$x=-\frac{5}{3}$$

$$\left\{-1,-\frac{5}{3}\right\}$$

#2:

Solutions:

a) $$n=-\frac{6}{5}$$

$$\left\{-\frac{6}{5}\right\}$$

#3:

Solutions:

a) $$p=9$$ or $$p=-5$$

{-5,9}

#4:

Solutions:

a) No solution: ∅

#5:

Solutions:

a) $$x=-1$$ or $$x=-2$$

{-2,-1}