因式分解:x²-4(x-1) 2x²+4x+2

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因式分解:x²-4(x-1) 2x²+4x+2

x²-4(x-1)
=x^2-4x+4
=x^2-4x+2^2
=(x-2)^2
2x²+4x+2
=2(x^2+2x+1)
=2(x+1)^2

x²-4(x-1)
=x²-4x+4
=(x-2)²
2x²+4x+2
=2(x²+2x+1)
=2(x+1)²