因式分解:(x^2十3x一3)(x^2十3x十4)一8

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因式分解:(x^2十3x一3)(x^2十3x十4)一8

因式分解:(x^2十3x一3)(x^2十3x十4)一8
因式分解:(x^2十3x一3)(x^2十3x十4)一8

因式分解:(x^2十3x一3)(x^2十3x十4)一8
=(x^2十3x一3)(x^2十3x十4)一8
=[(x^2十3x)一3][(x^2十3x)十4]-8
=(x^2十3x)^2+(x^2十3x)-12-8
=(x^2十3x)^2+(x^2十3x)-20
用十字相乘法
=(x^2十3x+5)(x^2十3x-4)
=(x^2十3x+5)(x+4)(x-1)

=x的四次+6x的三次+10x的平方+3x-20