Which of the following are solutions to the equation below ? 2x^2+18=20

Question

Which of the following are solutions to the equation below ? 2x^2+18=20

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Verity 3 years 2021-08-06T00:20:06+00:00 2 Answers 1 views 0

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  1. Farah
    0
    2021-08-06T00:21:37+00:00
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    Answer:

    there is no A B C or D

  2. binhan
    0
    2021-08-06T00:22:05+00:00
    Reply

    Answer:x=±1

    Step-by-step explanation:

    1 Subtract 1818 from both sides.

    2{x}^{2}=20-182x

    ​2

    ​​ =20−18

    2 Simplify  20-1820−18  to  22.

    2{x}^{2}=22x

    ​2

    ​​ =2

    3 Divide both sides by 22.

    {x}^{2}=1x

    ​2

    ​​ =1

    4 Take the square root of both sides.

    x=\pm \sqrt{1}x=±√

    ​1

    5 Simplify  \sqrt{1}√

    ​1

    ​​   to  11.

    x=\pm 1x=±1

    Done

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