Quadratic Equations - Definition & Examples

$3x^2 - 99x = 0$

$- 35x + 2= 0$

$7x^2 + 2xy - 30 = 0$

$4x^2 + 7x + 3$

$y^2 - 10y + 9 = 0$

$3x^2 - 62x + 5 = 1$