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3x³+5x²-15x-25=0
x²(3x+5)-5(3x+5)=0
(3x+5)(x²-5)=0
(3x+5)(x+√5)(x-√5)=0
3x+5=0 v x+√5=0 v x-√5=0
Odp. x∈{-√5, -5/3, √5}
b)
x^4(7x+4)-(7x+4)=0
(7x+4)(x^4-1)=0
(7x+4)(x²-1)(x²+1)=0
(7x+4)(x+1)(x-1)(x²+1)=0
Odp. x∈{-1. -4/7, 1}