x^4-6x²-7x-6=x²(x²-4)-2x²-7x-6 =x²(x+2)(x-2)-(2x+3)(x+2) =(x+2)[x²(x-2)-(2x+3)] =(x+2)(x³-2x²-2x-3) =(x+2)[x²(x-3)+x²-2x-3] =(x+2)[x²(x-3)+(x+1)(x-3)] =(x+2)(x-3)(x²+x+1) 不懂追问~ 希望我的回答对你有帮助，采纳吧O(∩_∩)O！
