# Thread: Is this the discriminate?

1. ## Re: Is this the discriminate?

Originally Posted by Plato
If $\displaystyle \Delta>0$ 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.