What is the difference between real roots and complex roots?
Real roots occur when D≥0 (the parabola meets the x-axis); complex roots occur when D<0 (it doesn't).
Real roots occur when D≥0 (the parabola meets the x-axis); complex roots occur when D<0 (it doesn't). A reliable way to keep them apart is to focus on what each one is defined by, not just the similar-sounding words.
Key point
real roots vs complex roots
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