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3x^4-10x³+10x-3=0
3(x^4-1)-10x(x²-1)=0
3(x²-1)(x²+1)-10x(x²-1)=0
(x²-1)(3x²+3-10x)=0
z tego mamy
x=1 v x=-1 v x=3 v x=1/3
2)
mnożę obustronnie przez(3x-2) i otrzymuję
9x²-5x=6x-4+x
9x²-12x+4=0
Δ=0
x=-b/2a=12/18=2/3