分解因式:(x^2-1)(x+3)(x+5)+12

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分解因式:(x^2-1)(x+3)(x+5)+12

分解因式:(x^2-1)(x+3)(x+5)+12
分解因式:(x^2-1)(x+3)(x+5)+12

分解因式:(x^2-1)(x+3)(x+5)+12
(x^2-1)(x+3)(x+5)+12
=(x+1)(x-1)(x+3)(x+5)+12
=[(x-1)(x+5)][(x+3)(x+1)]+12
=(x^2+4x-5)(x^2+4x+3)+12
=[(x^2+4x-1)-4][(x^2+4x-1)+4]+12
=(x^2+4x-1)^2-16+12
=(x^2+4x-1)^2-4
=(x^2+4x-1+2)(x^2+4x-1-2)
=(x^2+4x+1)(x^2+4x-3).

(-3 + 4 x + x^2)(1 + 4 x + x^2)
过程么,当然是先乘开,然后直接写答案吧。