因式分解x² -3x-9
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x^4-6x^3+9x^2-16=x^2(x^2-6x+9)-16=x^2(x-3)^2-16=[x(x-3)+4][x(x-3)-4]=(x^2-3x+4)(x^2-3x-4)=(x^2-3x+4)
不可能在实数域被分解,
3x*x+11x+10=(3x+5)(x+2)
(x+1)(x-3)=x²-3x+x-3=x²-2x-3
x^3-9x+8=(x^3-x)-(8x-8)=x(x^2-1)-8(x-1)=x(x+1)(x-1)-8(x-1)=(x-1)(x^2+x-8)
x^9+x^6+x^3-3=(x^9-1)+(x^6-1)+(x^3-1)=(x³-1))(x^6+x³+1)+(x³-1)(x³+1)+(x³-1)
-6x^2-x-9x^3=-x(1+6x+9x^2)=-x(3x+1)^2
(x-3)(x+3)
原式=-6x^2-x-9x^3=-x(1+6x+9x^2)=-x(1+3x)^2
=x^6(x^3-1)+x^5(x^3-1)+(x^3-1)+x^2=(x^3-1)(x^6+x^5+1)+x^2
x^9+x^6+x^2-3=(x^9-1)+(x^6-1)+(x^2-1)=(x^3-1)(x^6+x^3+1)+(x^2-1)(x^4+x^2+1)+(x^2-1)=(x-1)(x^2+x+1)(x
(x-1)(x-3)(x-5)(x-7)-9=(x-1)(x-7)(x-3)(x-5)-9=(x²-8x+7)(x²-8x+15)-9=(x²-8x)²+22(
原式=(x+1)[(x+1)²-9]=(x+1)(x+1+3)(x+1-3)=(x+1)(x+4)(x-2)
x^9+x^6+x^3+3=x^6(x^3+1)+(x^3+1)+2=(x^6+1)(x^3+1)+2望采纳!
这已是因式分解的最终结果:x⁴-81=(x²-9)(x²+9)=(x+3)(x-3)(x²+9)
x^9+x^6+x^3+1=x^6(x^3+1)+x^3+1=(x^3+1)(x^6+1)=(x+1)(x²-x+1)(x²+1)(x^4-x²+1)
原式=x立方+3x+3x平方+9=x(x平方+3)+3*(x平方+3)=(x+3)*(x平方+3)
X^3-9x=x(x^2-9)=x(x+3)(x-3)
=x(x平方+x-3)+9=x(x+2)(x-1)+9