Sign of quadratic between roots (a>0: parabola up ⇒ negative between roots, positive outside)
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a>0: parabola up ⇒ negative between roots, positive outside
What each symbol means
| Symbol | What it stands for |
|---|---|
| a,b,c | Quadratic coeffs |
| roots | Real distinct roots α<β |
When to use this
Distinct real roots and a≠0.