Решить уравнение простое 8y^2-7y+1=2

8y² - 7y + 1= 2
8y² - 7y - 1 = 0
D = 7² - 4 * 8 * (- 1) = 49 + 32 = 81
Y1,2 = (7 + - √81) / 16 = (7 + - 9) / 16
Y1 = (7 + 9)/16 = 1
Y2 = (7 - 9)/16 = - 2/16 = - 1/8 = - 0,125