分解因式:(1)x^4+4x^3+3x^2+4x+2 (2)x^4+x^3+x^2+2

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分解因式:(1)x^4+4x^3+3x^2+4x+2 (2)x^4+x^3+x^2+2
分解因式:(1)x^4+4x^3+3x^2+4x+2 (2)x^4+x^3+x^2+2

分解因式:(1)x^4+4x^3+3x^2+4x+2 (2)x^4+x^3+x^2+2
(1)
x^4+4x^3+3x^2+4x+2
=(x^4+3x^2+2)+4x^3+4x
=(x^2+1)(x^2+2)+4x(x^2+1)
=(x^2+1)(x^2+4x+2)
(2)
x^4+x^3+x^2+2
=x^4-x^3+x^2+2x^3-2x^2+2x+2x^2-2x+2
=x^2(x^2-x+1)+2x(x^2-x+1)+2(x^2-x+1)
=(x^2-x+1)(x^2+2x+2)

(1)x^4+4x^3+3x^2+4x+2
=x^4+4x^3+x^2 + 2x^2+4x+2
=x^2(X+2)²+2(X+2)²
=(X+2)²(x²+2)
(2)x^4+x^3+x^2+2
=x^4-x^3+x^2++2x³+2
=x²(x²-x+1)+2(x+1)(x²-x+1)
=(x²+2x+2)(x²-x+1)