X³-9x=x(x²-9)=x(x²-3²)=x(x+3)(x-3)
Вот держи
0.2*0.1(2х-6)=0.6
0,04(2х-6)=0.6
0.04х-0.12=0.6
0.04х=0.6+0.12
0.04х=0.72
х=0.72:0.04
х=18
все
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