X^2 + 3x + k = 0 (2) the equation has 2 roots. Deduce as much as you can about the value if k !

x^2 + 3x + k = 0 (2)
the equation has the number of roots shown in the bracket. Deduce as much as you can about the value of K.

I'm catching up on work & don't understand how to work this out?
Can anyone help
Thanks, Livviee xxxxx

x^2 + 3x + k = 0 (2)
a=1 b=3 c=0

4ac-b^2/4a
4(1)(0)-(3^2)/4(1)
-9/4 <------------------------answer

it's a parabola