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Question

Solve the equation |3x|=x21
  1. 5.25  or  -10.5
  2. -5.25  or  10.5
  3. 5.25  or  10.5
  4. -5.25  or  -10.5


Solution

The correct option is A 5.25  or  -10.5
           |3x|=x21
3x=x21            3x=x21
2x=21              4x=21
x=212                 4x=21
x=10.5                      x=5.25
Correct answer is option D.

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