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11 March, 22:28

Solve 5r2 - 12 = 68. {±4} {±5} {±3} {±6}

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Answers (2)
  1. 11 March, 22:44
    0
    Add 12 to both sides:

    5r^2 = 80

    Divide by 5:

    r^2 = 16

    Square root both sides:

    r = + / - 4

    The answer is {+ / - 4}.
  2. 11 March, 22:45
    0
    5r2-12=68

    +12 + 12

    5r2 = 80

    -80

    5r2 - 80 = 0

    :5 : 5 : 5

    r2 - 16 = 0

    +16 + 16

    r2 = 16

    root: r2 = root: 16

    r = {+ / - 4}
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