(x的平方-1)(x+3)(x+5)+15因式分解

问题描述:

(x的平方-1)(x+3)(x+5)+15
因式分解

(x的平方-1)(x+3)(x+5)+15
=(x-1)(x+1)(x+3)(x+5)+15
=(x-1)(x+5)[(x+1)(x+3)]+15
=(x²+4x-5)(x²+4x+3)+15
=(x²+4x)²-(x²+4x)-15+15
=(x²+4x)²-(x²+4x)
=(x²+4x)(x²+4x-1)

=(x-1)(x+1)(x+3)(x+5)+15=(x-1)(x+5)(x+1)(x+3)+15=(x²+4x-5)(x²+4x+3)+15=(x²+4x)²-2(x²+4x)-15+15=(x²+4x)²-2(x²+4x)=(x²+4x)(x²+4x-2)