x^4-9x^3-18x^2-194x+192分解因式

(x-8)*(x-6)*(x+1)*(x+4)
要能分解就有(X+X1)*(X+X2)*(X+X3)*(X+X4)
乖出来可以得到
X^4+(X1+X2+X3+X4)*X^3+(X1*X2+X3*X4+(X1+X2)*(X3+X4))*X^2+((X1+X2)*X3*X4+(X3+X4)*X1*X2)*X+X1*X2*X3*X4
则可知道解出方程组(X1+X2+X3+X4)=-9
X1*X2+X3*X4+(X1+X2)*(X3+X4)=-18
((X1+X2)*X3*X4+(X3+X4)*X1*X2)=-194
X1*X2*X3*X4=192
只要用第一、四个式子就可求出解

（x-11.8014)*(x-0.8874)*(x^2-3.688x+18.3336)
数值计算求解出来的，求x^4-9x^3-18x^2-194x+192＝0的四个根