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2014-11-10T21:07:36+02:00
E(x)= (2x+1)²- (x-1)²+ (x-2)(x+2)- 3x² +14= 4x²+4x+1 - (x²-2x+1) + x²-4 - 3x²+14=
4x²+4x+1-x²+2x-1+x²-4-3x²+14= x²+6x+10 

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