Nature of roots from discriminant (Positive D gives two distinct real roots; zero D repeated real; negative)
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Positive D gives two distinct real roots; zero D repeated real; negative D conjugate complex roots
What each symbol means
| Symbol | What it stands for |
|---|---|
| D | b²−4ac |
| a,b,c | Real coefficients |
When to use this
Real coefficients; for complex coefficients, ‘conjugate’ wording changes.