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2x³ = 50-300 /:2
x³= -125
x=-∛125
x= -5
b)
4x(x-2)(x+4)(x-4)=0
x=0 v x-2=0 v x+4=0 v x-4=0
Odp. x∈{-4, 0, 2, 4}
c)
x²(12x²+5x-2)=0
x²(12x²+6x-x-2)=0
x² * [6x(x+2)-(x+2)]=0
x² (x+2)(6x-1)=0
x=0 v x+2=0 v 6x-1=0
Odp. x∈{-2, 0, 1/6}