Pearson Algebra 1 Common Core, 2011
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Pearson Algebra 1 Common Core, 2011 View details
8. Unions and Intersections of Sets
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Exercise 54 Page 220

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

x≤- 4 or x≥ 10

Practice makes perfect
We are asked to find the solution set for all possible values of x in the given inequality. |x-3|≥ 7 To do this, 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 3 greater than or equal to 7 in the positive direction or in the negative direction.

x-3 ≥ 7 or x-3≤ - 7 Let's isolate x in both of these cases.

Case 1

x-3≥ 7
x≥ 10
This inequality tells us that all values greater than or equal to 10 will satisfy the inequality.

Case 2

x-3≤- 7
x≤- 4
This inequality tells us that all values less than or equal to - 4 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≥ 10 Second Solution Set:& x≤ - 4 Combined Solution Set:& x≤ - 4 or x≥ 10