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22 December, 08:03

Solve x2+4x-7=0 by completing the square

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Answers (2)
  1. 22 December, 08:28
    0
    (X+2) ^2 - 2 - 7

    (X+2+3) (x+2-3)
  2. 22 December, 08:44
    0
    -2 - √11

    -2+√11

    Step-by-step explanation:

    x²+4x-7=0 x²+4x+4 - 11=0 (x+2) ²-11=0 (x+2+√11) (x+2-√11) = 0 x+2+√11=0 ⇒ x = - 2 - √11 x+2 - √11=0 ⇒ x = - 2+√11
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