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Thread: Knowing when the roots of an expression include imaginary values

  1. July 1st 2009, 11:43 AM #1
    fcabanski
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    Knowing when the roots of an expression include imaginary values

    How does one know that

    4x^2 +3x + 2

    has imaginary values for x?
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  2. July 1st 2009, 11:45 AM #2
    Plato
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    ax^2 +bx+c=0 has complex (non-real) roots if b^2-4ac<0.
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  3. July 1st 2009, 12:29 PM #3
    fcabanski
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    Thanks!
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« Factor this expression to a+b | Find the equation of a parallel line »

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