因式分解x^3-7x^2+15x-9
问题描述:
因式分解x^3-7x^2+15x-9
谢谢
答
x^3-7x^2+6x+9x-9
=x(x-1)(x-6)+9(x-1)
=(x-1)(x^2-6x+9)
=(x-1)(x-3)^2