How to solve this two variable equation and save values?

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RAFAEL LOPES
RAFAEL LOPES 2019-10-26
回答： darova 2019-10-26
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?

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回答（2 个）

Nadir Altinbas
Nadir Altinbas 2019-10-26
k = 0 : 1 : 100;
darova
darova 2019-10-26
Try
for K = 0:100
roots([1 2 K 2])
end

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