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-x^4-x³
.............
= -3x³+3x²+16x+10
+3x³+3x²
....................
= 6x²+16x+10
-6x²-6x
.......................
= 10x+10
= -10x-10
................................
=================
(x+1)(x³-3x²+6x+10)
W(-1)=0
(x³-3x²+6x+10):(x+1)=x²-4x+10
-x³-x²
..........
= -4x²+6x+10
+4x²+4x
.................
= 10x+10
-10x-10
...........................
Δ=16-40 <0
x^4-2x³+3x²+16x+10=(x+1)(x+1)(x²-4x+10)=(x+1)²(x²-4x+10)