
x^3-4x^2-4x-5(因式分解)
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x^3-4x^2-4x-5
=(x^3-4x^2-5x)+(x-5)
=x(x^2-4x-5)+(x-5)
=x(x-5)(x+1)+(x-5)
=(x-5)[x(x+1)+1]
=(x-5)(x^2+x+1).
=(x^3-4x^2-5x)+(x-5)
=x(x^2-4x-5)+(x-5)
=x(x-5)(x+1)+(x-5)
=(x-5)[x(x+1)+1]
=(x-5)(x^2+x+1).
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