1. 18x^ - 6x + 1 = 0
a = 18, b = -6 , c = 1
D = b^ - 4ac
D = (-6)^ - 4x18x1 = 36-72 = -36 < 0 , корней нет.
2. 16x^2-8x+1 = 0
32x^ - 8x + 1 = 0
D = (-8)^ - 4 x 32 x 1 = - 64 < 0 , корней нет.
3. 49x^2 + 28x+4 = 0
49x^ - 14x + 2 = 0
D = (-14)^ - 4x49 x 2 = -196 < 0 , корней нет.
4. 36x^2 + 12x+1 = 0
На множители
(6x+1)^ = 0
36x^ + 12x + 1 = 0
(6x+1)^ = 0
6x + 1 = 0
6x = -1
x = - одна шестая или -0.1666