What is a real root?
I have the quadratic equation 3x^2 + 9x - 2 = 0.
I solve it using the quadratic formula and get
X = (-9 +- sqrt(105))/6
The discriminant is 105, which means this equation has two real roots - as far as I know, that is irreducible, and I'm unsure whether that's two real roots or not.
Edit:
WolframAlpha tells me this
x = 1/6 (-9-sqrt(105))
and
x = 1/6 (sqrt(105)-9)
Are these the same as what I have up there?


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