What number goes in the “?” ? – 2x – 5 = 5

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What number goes in the “?”

? – 2x – 5 = 5

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Linh Đan 5 years 2021-09-02T04:19:44+00:00 1 Answers 11 views 0

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  1. ngocdiep
    0
    2021-09-02T04:21:27+00:00
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    First, replace the “?” with an x:
    x – 2x – 5 = 5

    Next, combine alike terms:
    [ x – 2x ] – 5 = 5
    ^ alike terms

    This will result in:
    -x – 5 = 5

    You do the inverse (opposite) of -5
    -x -5 = 5
    +5

    Once you do the plus 5, the five moves to the end of the equation:
    -x – 5 = 5 + 5
    +5>>>>>^

    The “-5” no longer exists because you canceled it with the “+5” that you moved to the other side.
    The new equation:
    -x = [5 + 5]
    ^ you add these two

    After adding you get:
    -x = 10

    When putting “x” into a number it will ALWAYS be 1.

    You then divide both sides by the “x” (which is -1 since it it always equal to one but is negative because it has a negative sign on it)

    Your new equation:
    -x / -1 = 10 / -1

    If you divide to negatives, this will result in a positive.

    You’re left with:
    -x / -1 = x (since two negatives become a positive result)
    10 / -1 = 10 (if there’s a negative and positive when dividing, it will automatically become negative) [ONLY FOR DIVISION]

    At the end you’re left with:
    x = -10

    hope this helps!! if not feel free to reach out to me!!

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )