Expert2022-01-18Added 699 answers
We use the value of
The discriminant for this is
which looks better when written with an i notation. That's all.
I don't know how this is taught in the US but to me, i encountered this when i was at high school, learning how to solve for Quadratic Equations when the Discriminant is less than 0.
Next, note that
But for complex number's this is not true. Since if you take i and 0, we must have either
Expert2022-01-18Added 597 answers
Skilled2022-01-24Added 488 answers
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