Реши квадратное уравнение 2(5x−15)2−4(5x−15)+2=0

2(10x - 15)(10x - 15) - 50x + 75 + 2 = 0

2(100x² - 300x + 225) - 50x + 77 =0

200x² - 600x + 450 - 50x + 77 = 0

200x² - 650x + 527 0 =

D = b² - 4ac = 422500 - 421600 = 900 = 30²

x1 = ( 650 + 30) / 400 = 1,7

x2 = ( 650 - 30) / 400 = 1,55