x⁴-10x²+9十字相乘要过程

问题描述:

x⁴-10x²+9十字相乘要过程

x⁴-10x²+9
=x⁴-10x²+(-9)×(-1)
=(x²-9)(x²-1)
=(X+3)(X-3)(X+1)(X-1)十字相乘