Rozwiąż równanie a) 2x² - 9x - 35=0 b) 4x² - 13x +3=0 c) -6x² + 13x + 5 =0 d) 5x² - 6x + 6=0 e) -2x² + 5x -3 =0 f) 4x² + 12x + 9 = 0 g) 1/2 x² + x + 1 = 0 h) x² - x/2 - 1/2 = 0 i) 1/4x² - x/3 + 1/9 = 0

a) D = 81 + 280 = 361    Pierwiastek z delty - 19    x1 = (9 - 19) / 4 = - 10/4    x2 = (9+19) / 4 = 7 b) D = 169 - 48 = 121    Pierw z D = 11    x1 = (13-11)/8 = 1/4     x2 = (13+11)/8 = 3 c) D = 169 +120 = 289    Pierw z D = 17    x1 = (-13 - 17)/-12 = 30/12 = 5/2    x2= (-13+17)/-12 - -4/12 = -1/3 d) D = 36 - 120 = -84    Brak e)D = 25 - 24 = 1   Pierw z D = 1 x1 = (-5-1)/-4 = 3/2 x2 = (-5+1)/-4 = 1 f) Wzór skróconego mnożenia z tego jest (2x+3)^2 2x + 3 =0 x = -3/2 g)D = 1-2 = -1   Brak h)D = 1/4 +2 = 9/4   Pierw z D = 3/2 x1 = (1/2 - 3/2)/1 = -1 x2 = (1/2+3/2)/1 = 2 i) D = 1/9 - 1/9 = 0    x0 = (1/3) / (1/2) = 2/3 Jak coś się nie zgadza to pisz