What are the solutions to the equation y^2-1 = 80?

Question

What are the solutions to the equation y^2-1 = 80?

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Diễm Kiều 4 years 2021-07-26T21:50:18+00:00 2 Answers 27 views 0

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  1. Gerda
    0
    2021-07-26T21:51:32+00:00
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    y2−1=80

    Step 1: Add 1 to both sides.

    y2−1+1=80+1

    y2=81

    Step 2: Take square root.

    y=±√81

    y=9 or y=−9

    Answer:

    y=9 or y=−9

  2. hongcuc2
    0
    2021-07-26T21:51:59+00:00
    Reply

    Answer:

    y^2-1=80

    y^2=81

    y = positive and negative 9

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