(x+2)(x-3)(x+8)=(x-2)(x+4)(x+5)
(x^2-x-6)(x+8)=(x^2+2x-8)(x+5)
x^3+7x^2-14x-48=x^3+7x^2+2x-40
-14x-48=2x-40
16x=-8
x=-1/2
(x2-x-6)(x+8)=(x2+2x-8)(x+5)
x3+7x2-14x-48=x3+7x2+2x-40
16x=-8
x=-1/2
x^3+7x^2-14x-48=x^3+7x^2+2x-40
-16x=8
x=-1/2
(x+2)(x-3)(x+8)=(x-2)(x+4)(x+5)
(x+2)(x^2+5x-24)=(x-2)(x^2+9x+20)
化简得 x=2
根据多项式乘以多项式展开。x=-0.5