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trigonometry

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Complete the square to Solve Quadratic Equation:
Solve the equation. Express the answer in simplest radical form.
-x^2-7x=-11

Please Help!!!! Thanks.

  • trigonometry -

    -x^2-7x=-11
    x^2 - 7x = 11
    x^2 - 7x + 49/4 = 11 + 49/4
    (x - 7/2)^2 = 44/4 + 49/4
    x - 7/2 = ± √93/2
    x = (7 ±√93)/2

  • trigonometry -

    Thank you so much, but I was wondering:
    -x^2-7x=-11
    x^2 - 7x = 11

    You have to divide by -1, wouldn't it be positive 7x.

  • trigonometry -

    YOU ARE RIGHT!
    good for you for catching that.

    I am sure you can make the necessary changes.
    (there is one small change)

  • trigonometry -

    This is not a trigonometry question.

    x^2 + 7x + (7/2)^2 = 11 + (7/2)^2
    (x + 7/2)^2 = 23 1/4

    x = -7/2 +/- sqrt(93)/2

  • trigonometry -

    Thank you so much!!!!

    Could you please help me with another type of trig math question. I greatly appreciate your help.

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