SOLVING ABSOLUTE VALUE INEQUALITIES WORKSHEET

Solve the following absolute value inequalities :

Question 1 :

|2x + 1| ≤ 5

Question 2 :

|3x + 5| ≥ 7

Question 3 :

|x - 1| + 2 ≤ 5

Question 4 :

|2x - 3| - 5 ≥ 7

Question 5 :

2|x + 1| ≤ 6

Question 6 :

5|x - 3| ≥ 15

Question 7 :

2|x + 3| + 5 ≤ 13

Question 8 :

5|x +7| - 2 ≥ 18

Question 9 :

|x + 3| < 13

Question 10 :

|x +7| > 18

1. Answer :

|2x + 1| ≤ 5

2x + 1 ≤ 5  or  2x + 1 ≥ -5

2x ≤ 4  or  2x ≥ -6

x ≤ 2  or  x ≥ -3

Hence, the solution is

-3 ≤ x ≤ 2

2. Answer :

|3x + 5| ≥ 7

3x + 5 ≥ 7  or  3x + 5 ≤ -7

3x ≥ 2  or  3x ≤ -12

x ≥ 2/3  or  x ≤ -4

Hence the solution is

(-∞, -4] U [2/3, +∞)

3. Answer :

|x - 1| + 2 ≤ 5

Subtract 2 from both sides.

|x - 1| ≤ 3

x - 1 ≤ 3  or  x - 1 ≥ -3

x ≤ 4  or  x ≥ -2

Hence the solution is

-2 ≤ x ≤ 4 

4. Answer :

|2x - 3| - 5 ≥ 7

Add 5 to both sides.

|2x - 3| ≥ 12

2x - 3 ≥ 12  or  2x - 3 ≤ -12

2x ≥ 15  or  2x ≤ -9

x ≥ 15/2  or  x ≤ -9/2

Hence the solution is

(-∞, -9/2] U [15/2, +∞)

5. Answer :

2|x + 1| ≤ 6

Divide both sides by 2.

|x + 1| ≤ 3

x + 1 ≤ 3  or  x + 1 ≥ -3

x ≤ 2  or  x ≥ -4

Hence the solution is

-4 ≤ x ≤ 2

6. Answer :

5|x - 3| ≥ 15

Divide both sides by 5.

|x - 3| ≥ 3

x - 3 ≥ 3  or  x - 3 ≤ -3

x ≥ 6  or  x ≤ 0

Hence the solution is

(-∞, 0] U [6, +∞)

7. Answer :

2|x + 3| + 5 ≤ 13

Subtract 5 from both sides.

2|x + 3| ≤ 8

Divide both sides by 2.

|x + 3| ≤ 4

x + 3 ≤ 4  or  x + 3 ≥ -4

x ≤ 1  or  x ≥ -7

Hence the solution is

-7 ≤ x ≤ 1

8. Answer :

5|x +7| - 2 ≥ 18

Add 2 to both sides.

5|x +7| ≥ 20

Divide both sides by 5.

|x +7| ≥ 4

x + 7 ≥ 4  or  x + 7 ≤ -4

x ≥ -3  or  x ≤ -11

Hence the solution is

(-∞, -11] U [-3, +∞)

9. Answer :

|x + 3| < 13

x + 3 < 13  or  x + 3 > -13

x < 10  or  x > -16

Hence the solution is

-16 < x < 10

10. Answer :

|x +7| > 18

x + 7 > 18  or  x + 7 < -18

x > 11  or  x < -25

Hence the solution is

(-∞, -25) U (11, +∞)

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