11z^2 + 33z - z - 3 = 0
11z^2 + 32z - 3 = 0
D = 32^2 + 4*3*11 = 1024 + 132 = 1156 = 34^2
z₁ = ( - 32 + 34)/22 = 2/22 = 1/11
z₂ = ( - 32 - 34)/22 = - 66/22 = - 3
Ответ
- 3; 1/11
1. y' = 3x²+4x+1
3x²+4x+1 = 0
Т.к a-b+x = 0:
x1 = -1
x2 = -c/a = -1/3
Метод интервалов:
+. -. +
-----------------[-1]-----------[-1/3]---------------
x = -1 - max
y(-1) = -1+2-1+3 = 3
(-1; 3)
2. y' = 3x²-6x
3x(x-2) = 0
x = 0
x = 2
Метод интервалов:
+. -. +
-----------------[0]------------[2]---------------
x = 2 - min
y(2) = 8-3•4+2 = 8-12+2 = -2
4х-12=х+15
4х-х=12+15
3х=27
х=9
(1,2t4s3-0,9k)(1,2t4s3+0,9k)