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12 September, 16:56

Ryan needs to solve the equation x2-8x-9=0 by completing the square. Which pair of steps is the most efficient way to begin?

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Answers (2)
  1. 12 September, 19:39
    0
    The answer is {-1,2}
  2. 12 September, 20:03
    0
    X^2 - 8x - 9 = 0

    x^2 - 8x = 9

    (x - 4) ^2 - 16 = 9

    (x - 4) ^2 = 25

    x - 4 = + / - sqrt25 = + / - 5

    x = 5 + 4, - 5 + 4

    Solution set is {-1, 9}
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