Error: Forgot to write the compound inequality Correct Solution: -15
Practice makes perfect
Consider the given exercise.
To solve absolute value inequalities we must write the given inequality as two separate cases. If we have an inequality of the form |x+a|non-negative number, we can write it as a compound inequality.
x+a < b and x+a>- b
Notice that in the work provided the second case was not considered. The student should have also solved x-5>- 20.
Let's solve the inequality by correcting this mistake!
