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21 June, 07:49

Solve by completely the square x^2-8x-20=0

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Answers (2)
  1. 21 June, 07:56
    0
    x = - 2, 10.

    Step-by-step explanation:

    x^2-8x-20=0

    (x - 4) ^2 - 16 - 20 = 0

    (x - 4) ^2 = 36

    x - 4 = + / -sqrt36

    x = 4+6, 4 - 6

    x = - 2,10
  2. 21 June, 08:10
    0
    x=5

    Step-by-step explanation:

    x^2 is 1
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