Common root of two quadratics (A value α that makes both quadratics zero; subtract suitable multiples)
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A value α that makes both quadratics zero; subtract suitable multiples to get a linear equation in α
What each symbol means
| Symbol | What it stands for |
|---|---|
| ai,bi,ci | Coefficients of the two equations |
When to use this
Typically a1,a2 nonzero; degenerate cases need separate check.