How to solve this two variable equation and save values?

Hello,

I have this two variable equation: X³+2X²+KX+2=0

Where 0≤K≤100.

All I need to do is to verify for which values of K, X≤0

I have tryied some 'for' and 'solve' methods but I'm getting this sort of results:

Can anybody help me?

Answer 1

[Nadir Altinbas]

k = 0 : 1 : 100;

Answer 2

[darova]

Try

for K = 0:100
    roots([1 2 K 2])
end