Question

Solve. (Enter your answer using interval notation.)
|3x + 15| > 21

Answer 1

(-∞, -12), (2, ∞)

or

(-∞, -12) U (2, ∞)

Explanation:

|3x + 15| > 21, |3x + 15| < -21

3x + 15 > 21, 3x + 15 < - 21

-15 -15 -15 -15

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3x > 6 3x < - 36

÷3 ÷3 ÷3 ÷3

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x > 2 x < -12

(-∞, -12), (2, ∞)

or

(-∞, -12) U (2, ∞)

I hope this helps!