NUMBER AND QUANTITY - ACT
discriminant: b² – 4ac If . . . b = y-intercept = (0,b) distance formula: √[(y1 – y2)² + (x1 – x2)²] midpoint formula: midpoint = [(x1 + x2)/2, (y1 + y2)/2] quadratic formula: X= -b +√b2 - 4ac 2a • discriminant > 0 2 ˜ real solutions • discriminant = 0 1 ˜ real solution • ˜discriminant < 0 no real solutions O y x (x y
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