a) f(x) = 3x² + 8x +2
(3x² + 8x + 2)' = 0
6x + 8 = 0
6x = -8
x = -8/6 = -4/3 = -1 целых 1/3
b) f(x) = -6x² + 13x - 1
( -6x² + 13x - 1)' = 0
-12x + 13 = 0
-12x = -13
12x = 13
x = 13/12 = 1 ц 1/12
с) ) f(x) = 3/2x² + 4x - 1
( 3/2x² + 4x - 1)' = 0
3x + 4 = 0
3x = -4
x = -4/3 = 1 ц 1/3
d) f(x) = -0.5x² - 4x + 0.1
(-1/2x² - 4x + 0.1)' = 0
-x -4 = 0
-x = 4
x = -4