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Question

Solve the inequality with absolute value
3|2x+4|<=4

A
(,73)
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B
(73,+)
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C
(73,+73)
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D
(0,73)
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E
(,+)
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Solution

The correct option is E (,+)
Since |x|=x and x,
therefore, 3|2x+4|<=4 may be calculated as:
3(2x+4)<=4 and 3(2x+4)<=4
6x12<=4 and 6x+12<=4
6x<=4+12 and 6x<=412
x<=83 and x>=43
Therefore, x lies between (,+).

Hence, option E is correct.

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