Big Ideas Math Integrated I, 2016
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Big Ideas Math Integrated I, 2016 View details
6. Solving Absolute Value Inequalities
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Exercise 4 Page 89

Create an or compound inequality because the absolute value is greater than the given value.

Solution Set: x<-11 or x>5
Graph:

Practice makes perfect
We are asked to find and graph the solution set for all possible values of x in the given inequality. |x+3|> 8 To do this, we will create a compound inequality by removing the absolute value. In this case, and since x+3 can be written as x-(- 3), the solution set contains the numbers that make the distance between x and - 3 greater than 8 in the positive direction or in the negative direction. x+3 > 8 or x+3< - 8

Let's isolate x in both of these cases before graphing the solution set.

Case 1

We can solve the inequality by performing inverse operations on both sides of the inequality. Let's solve the first case.
x+3 > 8
x> 5
This inequality tells us that all values greater than 5 will satisfy the inequality.

Case 2

Now, let's solve the second case of the inequality.
x+3<- 8
x< -11
This inequality tells us that all values less than - 11 will satisfy the inequality.

Solution Set

The solution to this type of compound inequality is the combination of the solution sets. First Solution Set:& x>5 Second Solution Set:& x<-11 Combined Solution Set:& x<-11 or x>5

Graph

The graph of this inequality includes all values less than - 11 or greater than 5. We show this by using open circles on the endpoints.