因式分解:(x²+3x-3)(x²+3x+4)-8

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因式分解:(x²+3x-3)(x²+3x+4)-8
因式分解:(x²+3x-3)(x²+3x+4)-8

因式分解:(x²+3x-3)(x²+3x+4)-8
(x²+3x-3)(x²+3x+4)-8
=(x²+3x)²+(x²+3x)-12-8
=(x²+3x)²+(x²+3x)-20
=(x²+3x+5)(x²+3x-4)
=(x²+3x+5)(x-4)(x+1)

=(x²+3x)²+(x²+3x)-20
=(x²+3x+5)(x²+3x-4)
=(x²+3x+5)(x+4)(x-1)

(x²+3x-3)(x²+3x+4)-8
设x²+3x=t
原式=(t-3)(t+4)-8
=t²+t-20
=(t+5)(t-4)
=(x²+3x+5)(x²+3x-4)
=(x²+3x+5)(x+4)(x-1)