elementary algebra

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(3b+1)^2=16

  • elementary algebra -

    (3b+1) (3b +1) = 16

    9b^2 + 3b +3b + 1 = 16

    9b^2 + 6b + 1 = 16

    9b^2 + 6b + 1 -16 = 16-16

    9b^2 + 6b -15 = 0

    3(3b^2 + 2b -5) = 0

    3(b-1)(3b+5) = 0

    b - 1 = 0 3b + 5 = 0
    b -1+1 = 0 + 1 3b + 5 - 5 = 0-5
    b = 1 3b = -5
    3b/3 = -5/3
    b = -5/3
    b = 1, -5/3

  • elementary algebra -

    (3b+1)^2=16
    3b+1 = ±4

    3b+1 = 4
    b = 1
    or
    3b+1 = -4
    b = 5/3

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