# Is this the discriminate?

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• September 12th 2012, 02:04 PM
Mukilab
Re: Is this the discriminate?
Quote:

Originally Posted by Plato
If $\Delta>0$ there are two real roots.

The question says to prove that x^2+2kx-5 has two real roots

That means I need to assume that its discriminant is >0. Which is k^2+5. k^2+5 has no real roots, therefore there is no way I can prove the equation has real roots.
• September 12th 2012, 02:06 PM
Mukilab
Re: Is this the discriminate?