Answer
A={$ax^{2}+bx+c=0|b²-4ac\lt0┊$}
Work Step by Step
The equation $ax^{2}+bx+c=0$ has complex roots; if the value of the discriminant $b^{2}-4ac$ is negative:
A={$ax^{2}+bx+c=0|b²-4ac\lt0┊$}
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