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16 July, 14:18

Solve the equation. x2 + 8x - 9 = 0 A) x = 1 B) x = 9 C) x = 9 or x = - 1 D) x = - 9 or x = 1

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  1. 16 July, 14:31
    0
    x=1 or x=-9

    Step-by-step explanation:

    x^2 + 8x - 9 = 0 (8x=9x-x)

    x^2 - x+9x-9=0

    x (x-1) + 9 (x-1) = 0

    (x-1) (x+9) = 0

    x-1=0 or x+9=0, then

    x=1 or x=-9
  2. 16 July, 14:48
    0
    Answer:D. X = - 9 or x = 1

    X2 + 8x - 9 = 0
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