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Math Help - quadradic

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    Lightbulb quadradic

    13. Determine the values of c for which x^2 + 2cx - 4 will have exactly 2 real roots.
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    Quote Originally Posted by rlarach View Post
    13. Determine the values of c for which x^2 + 2cx - 4 will have exactly 2 real roots.
    Apply the following:

    For the quadratic Ax^2 + Bx + C the discriminant is defined to be \Delta = B^2 - 4AC.

    \Delta > 0 \, : The quadratic has 2 real roots
    .
    \Delta = 0 \, : The quadratic has 1 (repeated) root.

    \Delta < 0 \, : The quadratic has no real roots.

    Do not confuse the c in your question with the C in the above formulae.
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