December 2018 1 56 Report
Równanie x²+6x+c²=0 ma dwa różne rozwiązania wtedy i tylko wtedy, gdy:

A: c∈ (-∞,3)
B: c∈ (3,+∞)
C: c∈ (-3,3)
D: c∈ (-∞,-3) (3,+∞)
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