3x²+x²+4x-4因式分解怎么做?
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3x²+x²+4x-4因式分解怎么做?
3x²+x²+4x-4因式分解怎么做?
3x²+x²+4x-4因式分解怎么做?
3x²+x²+4x-4
=4x²+4x-4
=4(x²+x-1)
=4[x²+x+(1/2)²-5/4]
=4[(x+1/2)²-(√5/2)²]
=4(x+1/2+√5/2)(x-1/2-√5/2)
=(2x+1+√5)(2x-1-√5)