因式分解:(x方-1)(x+3)(x+5)+12过程!

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因式分解:(x方-1)(x+3)(x+5)+12过程!因式分解:(x方-1)(x+3)(x+5)+12过程!因式分解:(x方-1)(x+3)(x+5)+12过程!(x^2-1)(x+3)(x+5)+1

因式分解:(x方-1)(x+3)(x+5)+12过程!
因式分解:(x方-1)(x+3)(x+5)+12
过程!

因式分解:(x方-1)(x+3)(x+5)+12过程!
(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).