=(a³-2a²)+(18-9a)=a²(a-2)-9(a-2)=(a-2)(a²-9)=(a-2)(a-3)(a+3)
2) =a²b²(a³+27b³)=a²b²(a+3b)(a²-3ab+9b²)
1) 1/4x²=0,16
x²=0,16*4
x²=0,64
x₁=0,8
x₂=-0.8
