Reynosa is a city in the state of Tamaulipas, Mexico. Reynosa is located at 26.08°N, 98.28°W, across the Rio Grande (Rio Bravo) from McAllen, Texas. In 2003 the estimated population of Reynosa was about 447,000 people.
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... computing roots numerically, the usual form of the quadratic formula is not ideal. See Loss of significance for details.
Derivation
The quadratic formula is derived ...