How do you solve #abs [3x+9]=7#?

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Answer 1 · 2017-09-04T14:19:50

The answer is #-2/3# or #-16/3#.

Given:

#|3x+9|=7#

therefore, either

#3x+9=7" " or " "-3x-9=7#

#3x=7-9" " or " "-3x=7+9#

#3x=-2" " or " "-3x=16#

#x=-2/3" " or " "x=-16/3#

The answer is #-2/3# or #-16/3#.