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20 January, 07:53

Solve for x: |2x + 6| - 4 = 20 x = 9 and x = 11 x = - 9 and x = 15 x = 9 and x = - 15 No solution

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  1. 20 January, 07:55
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    |2x + 6| - 4 = 20

    x = 9: |2x + 6| - 4 = 20

    |2 (9) + 6| - 4 = 20

    |18 + 6| - 4 = 20

    |24| - 4 = 20

    24 - 4 = 20

    20 = 20

    x = 11: |2x + 6| - 4 = 20

    |2 (11) + 6| - 4 = 20

    |22 + 6| - 4 = 20

    |28| - 4 = 20

    28 - 4 = 20

    24 ≠ 20

    x = - 9: |2x - 6| - 4 = 20

    |2 (-9) - 6| - 4 = 20

    |-18 - 6| - 4 = 20

    |-24| - 4 = 20

    24 - 4 = 20

    20 = 20

    x = 15: |2x - 6| - 4 = 20

    |2 (15) - 6| - 4 = 20

    |30 - 6| - 4 = 20

    |24| - 4 = 20

    20 = 20

    x = - 15: |2x - 6| - 4 = 20

    |2 (-15) - 6| - 4 = 20

    |-30 - 6| - 4 = 20

    |-24| - 4 = 20

    24 - 4 = 20

    20 = 20

    The answer to x is equal to 9, 15, - 9, and - 15.
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