х² + 5х + 4 = 0
x² + 4x + x + 4 = 0
x (x + 4) + x + 4 = 0
(x + 4) (x + 1) = 0
x + 4 = 0
x + 1 = 0
x = -4
x = -1
x1 = -4, x2 = -1
х² + 5х + 4 = 0
x² + 4x + x + 4 = 0
x (x + 4) + x + 4 = 0
(x + 4) (x + 1) = 0
x + 4 = 0
x + 1 = 0
x = -4
x = -1
x1 = -4, x2 = -1