分解因式a⁴-4a²-4a+8

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分解因式a⁴-4a²-4a+8

a⁴-4a²-4a+8=a²(a²-4)-4(a-2)=a²(a+2)(a-2)-4(a-2)=(a-2)(a^3+2a^2-4)

=a^2(a^2-4)-4(a-2)
=a^2(a+2)(a-2)-4(a-2)
=(a-2)(a^3+2a^2-4)

a^4-4a²-4a+8
=a²(a²-4)-4(a-2)
=a²(a+2)(a-2)-4(a-2)
=[a²(a+2)-4](a-2)