3 years ago

Solve for x: |3x + 12| = 18

1 answer:

4 0

$|3x+12|=18\iff3x+12=18\ \vee\ 3x+12=-18\\\\\text{Subtract 12 from both sides}\\\\3x=6\ \vee\ 3x=-30\qquad\text{divide both sides by 3}\\\\\boxed{x=2\ \vee\ x=-10}\to\boxed{A.}$

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