this math tho

posted by This Girl

31. Solve the equation by completing the square. Round to the nearest hundreth if necessary.

x^2 - 6x = 7

x = 7, 1
x = -7, 1
x = -7, -1
x = 7, -1

  1. Damon

    x^2 - 6 x + (6/2)^2 = 7 + (6/2)^2

    x^2 - 6 x + 9 = 7 + 9

    (x-3)^2 = 16

    (x-3) = 4 or (x-3) = -4

    x = 7 or x = -1

    check
    1 + 6 = 7
    49 - 42 = 7

  2. This Girl

    okay thanks, I was thinking that.

  3. Damon

    You are welcome :)
    No thinking, just doing and CHECKING

  4. This Girl

    okay...haha I'll do it...then check!! thanks Damon!

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