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Math Help - Questions for exam tomorrow

  1. #1
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    Questions for exam tomorrow

    C1 exam tormorrow, got some last minute questions.

    5.The equation 2x^2 -3x - (k + 1) = 0, where k is a constant, has no real roots.

    Find the set of possible values of k.

    So I use  b2-4ac<0?

    If the question said:

    5.The equation 2x^2 -3x - (k + 1) = 0, where k is a constant, has equal roots.

    I would use:  \sqrt b2-4ac=0?

    And if the question said

    5.The equation 2x^2 -3x - (k + 1) = 0, where k is a constant, 2 real roots.

    I would use:  b2-4ac>0?
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  2. #2
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    Hi

    Yes that's it
    For the second example you made a typing error : b^2 - 4ac = 0
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  3. #3
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    Quote Originally Posted by Ifailatmaths View Post
    C1 exam tormorrow, got some last minute questions.

    5.The equation 2x^2 -3x - (k + 1) = 0, where k is a constant, has no real roots.

    Find the set of possible values of k.

    So I use  b2-4ac<0?

    If the question said:

    5.The equation 2x^2 -3x - (k + 1) = 0, where k is a constant, has equal roots.

    I would use:  \sqrt b2-4ac=0?

    And if the question said

    5.The equation 2x^2 -3x - (k + 1) = 0, where k is a constant, 2 real roots.

    I would use:  b2-4ac>0?
    Precisely
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  4. #4
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    Quote Originally Posted by running-gag View Post
    Hi

    Yes that's it
    For the second example you made a typing error : b^2 - 4ac = 0
    Typing error I thought I used a square root when its equal roots?
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  5. #5
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    I only meant that you wrote \sqrt b2-4ac=0 instead of b^2-4ac=0
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  6. #6
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    Quote Originally Posted by running-gag View Post
    I only meant that you wrote \sqrt b2-4ac=0 instead of b^2-4ac=0

    Ah gotcha, cheers.
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