Решите тоже : (2х*-5х-7)(х-1)=0 * - квадрат

(2х^2-5х-7)(х-1)=0

х-1=0  или  2х^2-5х-7 = 0

x = 1              D = (-5)^2 - (-7) * 2 * 4 = 25 + 56 = 81>0

                       x1 = -(-5) + √81/4 = 5 + 9/4 = 3,5

                       x2 = -(-5) - √81/4 = 5 - 9/4 = -4/4 = -1

ответ: 1; -1; 3,5.