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Math Help - Knowing when the roots of an expression include imaginary values

  1. #1
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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. #2
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    ax^2 +bx+c=0 has complex (non-real) roots if b^2-4ac<0.
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    Thanks!
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