2x³-50x=0 2x*(x²-25)=0 x*(x²-25)=0 x=0 x²-25=0 x=0 x=5 x=-5
x₁=-5 x₂=0 x₃=5
16x³+8x²+x=0 x*(16x²+8x+1)=0 x*(4x+1)²=0 x=0 (4x+1)²=0 x=0 x=-1/4
x₁=-1/4 x₂=0
x³+2x²-36x-72=0 x²*(x+2)-36(x+2)=0 (x+2)*(x²-36)=0 x+2=0 x²-36=0 x=-2 x=6 x=-6
x₁=-6 x₂=-2 x₃=6