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    Vicky419's Avatar
    Vicky419 Posts: 1, Reputation: 1
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    #1

    Jan 10, 2008, 08:06 PM
    precalculus.real or imaginary roots
    how do I find any real or imaginary roots using the discriminant... the quadratic function is f(x)=-2x^2+4x-10:confused:??
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    tangliang126 Posts: 1, Reputation: 1
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    #2

    Jan 13, 2008, 12:35 PM
    quadratic formula x=(-b (+or-) square root((b^2)-4ac))/2a for any quadratic function y=ax^2+ bx + c. there will be an imaginary root if (b^2)-4ac) is negative, because there will be an imaginary root if the number inside the square root is negative. For your question there is an imaginary root because (4^2)-4(-2)(-10) is negative.
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