What is the solution of |3 x + 9| ≤ 15 ?

a. - 8 ≤ x ≤ 2

b. - 2 ≤ x ≤ 8

c. - 24 ≤ x ≤ 6

d. -15 ≤ x ≤ 15

answer is OPTION A - 8 ≤ x ≤ 2

|3 x + 9| ≤ 15 ?

3x + 9 ≤ +/-15

-15 ≤ 3x + 9 ≤ +15

-15 - 9 ≤ 3x ≤ +15 - 9

-24 ≤ 3x ≤ +6

-24/3 ≤ x ≤ +6 /2

-8 ≤ x ≤ 2

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