There are always 2 solutions, if d>0 you get 2 real solutions, if d=0 you get a double root solution e.g. 1 and 1. If d<0 you get 2 imaginary solutions.
North- and South Korea are still technically at war, and as South Korea are allied to the US, the odds of North Korea resuming the war efforts against South Korea are probably pretty high.
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