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15 April, 14:08

If using the method of completing the square to solve the quadratic equation x^2+17x+12=0x 2 + 17x+12=0, which number would have to be added to "complete the square"?

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Answers (2)
  1. 15 April, 15:08
    0
    289/4

    Step-by-step explanation:

    x² + 17x + 12 = 0

    x² + 17x = - 12

    Take half of the second coefficient, square it, then add the result to both sides.

    (17/2) ² = 289/4

    x² + 17x + 289/4 = - 12 + 289/4

    (x + 17/2) ² = 241/4
  2. 15 April, 15:58
    0
    (x+7/2) = 1/4

    Step-by-step explanation:

    I got it on Khan Academy, trust me. It's right. I got it wrong because of the other answer here, so your welcome, but this is the correct answer, Khan Academy people.
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