2014: Christopher Clapham and James Nicholson: The Concise Oxford Dictionary of Mathematics (5th ed.) .(next): Chapter $4$: Lure of the Unknown: Algebra 2008: Ian Stewart: Taming the Infinite .2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) .1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) .(next): $1$: Complex Numbers: Solved Problems: Polynomial Equations: $31$ Spiegel: Theory and Problems of Complex Variables (SI ed.) . (next): $\S 1$: Real Numbers: $\S 1.10$: Quadratic equations Binmore: Mathematical Analysis: A Straightforward Approach . Here, x is the variable and a, b and c are constants where a 0. ![]() (next): $\S 9$: Solutions of Algebraic Equations: $9.1$: Quadratic Equation An equation of the form ax2 bx c 0 is known as a quadratic equation. An equation that employs the variable x having the general form ax2 bx c 0, where a, b, and c are constants and a does not. Spiegel: Mathematical Handbook of Formulas and Tables . ![]() The general algebraic formulation of its solution did not appear until at least $100$ CE. ![]() The ancient Greeks, a thousand years or so later, solved quadratics by geometric constructions. The ancient Babylonians knew the technique of solving quadratic equations as long ago as $1600$ BCE.
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