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5x-4x-15x+10x+6x-6=0
2x=6
x=3
2)x^5-4x^3+x^2-4=0
5x-12x+2x-4=0
5x=4
x=4/5
x^4(x-1)-5x^2(x-1)+6(x-1)=0
(x^4-5x^2+6)(x-1)=0 <- x=1
z=x^2
z^2-5z+6=0
Δ=5^2-4*6=25-24=1
√Δ=1
x1=(5-1)/2=2
x2=(5+1)/2=3
x3=1
2)x^5-4x^3+x^2-4=0
x³(x²-4)+1(x²-4)=0
(x³+1)(x²-4)=0
x=-1 x=2 lub x=-2