Pearson Algebra 1 Common Core, 2011
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Pearson Algebra 1 Common Core, 2011 View details
6. Exponential Functions
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Exercise 58 Page 459

Since the absolute value is greater than or equal to the given value, you can create an or compound inequality.

Solution Set: x≤-5 or x≥9
Graph:

Practice makes perfect
We are asked to find and graph the solution set for all possible values of x in the given inequality. 11≤|x-2|+4 Before we remove the absolute value we need to rearrange the inequality.
11≤|x-2|+4
7≤|x-2|
|x-2|≥7

To find the solution set, we will create a compound inequality by removing the absolute value. In this case, the solution set contains the numbers that make the distance between x and 2 greater than or equal to 7 in the positive direction or in the negative direction. x-2 ≥ 7 or x-2≤ -7 Let's isolate x in both of these cases before graphing the solution set.

Case 1

x-2 ≥ 7
x ≥ 9
The above tells us that all values greater than or equal to 9 will satisfy the inequality.

Case 2

x-2 ≤ - 7
x ≤ - 5
This tells us that all values less than or equal to - 5 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 ≥ 9 Second Solution Set:& x ≤ - 5 Combined Solution Set:& x≤ - 5 or x≥ 9

Graph

The graph of this inequality includes all values less than or equal to - 5 or greater than or equal to - 9. We show this by keeping the endpoints closed.