分解因式 (x²+3x+2)*(x²+7x+12)—120

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分解因式 (x²+3x+2)*(x²+7x+12)—120

分解因式 (x²+3x+2)*(x²+7x+12)—120
分解因式 (x²+3x+2)*(x²+7x+12)—120

分解因式 (x²+3x+2)*(x²+7x+12)—120
(x²+3x+2)*(x²+7x+12)-120
=(x+1)(x+2)(x+3)(x+4)-120
=(x+1)(x+4)(x+2)(x+3)-120
=(x²+5x+4)(x²+5x+6)-120
=(x²+5x+4)[(x²+5x+4)+2]-120
=(x²+5x+4)²+2(x²+5x+4)-120
=(x²+5x+4+12)(x²+5x+4-10)
=(x²+5x+16)(x²+5x-6)
=(x²+5x+16)(x+6)(x-1)

原式=(x+1)*(x+2)*(x+4)*(x+3)-120
=(x+1)*(x+4)*(x+2)*(x+3)-120
=(x*x+5x+4)*(x*x+5x+6)-120
=(x*x+5x)*(x*x+5x)+10*(x*x+5x)+24-120
=(x*x+5x)*(x*x+5x)+10*(x*x+5x)-96
=(x*x+5x-6)(x*x+5x+16)
=(x-1)(x+6)(x*x+5x+16)
完成