Which equations are incomplete quadratic equations? a) x - 4 = 0 d) 2x - 4 = 2x? + 8x 9. b) x - 4x = 0 e) x? 4 c) 3x = 2x f) r - 2x – 3 = 0

What is the value of the discriminant for the quadratic equation  4x2 -  25=0

By completing the square, the expression x2+4x+19x2+4x+19 equals (x+A)2+B(x+A)2+Bwhere A and b

A person standing close to the edge on top of a 84-foot building throws a ball vertically upward. The quadratic equation h = - 16t? + 100t + 84 models the ball's height above the ground, h, in feet, t seconds after it was thrown. a) What is the maximum height of the ball? feet b) How many seconds does it take until the ball hits the ground? seconds