因式分解 2x²-4x+2 x²-3x-28 a^3+a²-a-12x²-4x+2 x²-3x-28 a^3+a²-a-1

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因式分解 2x²-4x+2 x²-3x-28 a^3+a²-a-1
2x²-4x+2 x²-3x-28 a^3+a²-a-1

x²-4x+2
=2(x²-2x+1)
=2(x-1)²
x²-3x-28
=(x+4)(x-7)

a^3+a²-a-1
=a²(a+1)-(a+1)
=(a+1)(a²-1)
=(a+1)²(a-1)