几道因式分解题,1.x三次方+3x²-4乘x的三次方+3x²-4 2.x三次方+9x²+26x+24

题目

几道因式分解题,1.x三次方+3x²-4乘x的三次方+3x²-4 2.x三次方+9x²+26x+24
3.x四次方+3乘x的三次方-3x²-12x-4

答案

1.(x^3+3x^2-4)(x^3+3x^2-4)=(x+4)(x-1)*(x+4)(x-1)=)=(x+4)^2(x-1)^2
2.x^3+9x^2+26x+24=
3.x^4+3x^3-3x^2-12x-4=x^3(x+3)-3x(x+3)-3(x+3)+5=