What are Vieta's formulas? Why do they matter so much.
If you have a quadratic equation: y = ax2 + bx + c that has roots r1 and r2, then
r1 + r2 = -b/a and r1 · r2 = c/a
They make some of the questions about quadratics quicker to solve.
For a fuller discussion, go to Wikipedia ...
This also ties in for quadratic, cubics, and other higher degree polynomials.
