Historical clue formulations

• Graph of y = ax^2 + bx + c, for example — 2026-04-08
• One with a focus in mathematics — 2018-05-05
• What's represented by x2 = 4py — 2010-02-21
• Geometric curve — 2010-01-25
• Graph of the equation y = ax2 + bx + c — 2008-03-27
• It has a mathematical focus — 2003-12-27
• Firecracker's path — 2001-08-19
• Geometry line — 2000-01-02
• Result of plotting, perhaps — 1998-01-17