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E(x)=3(x-2)²-(2x+3)²+(x-1)•(x+1)
urgent!!​


Răspuns :

Răspuns:

3(x²-2•x•2+2²)-(4x²+2•2x•3+3²)+(x²+1²)

=3x²-12x+12-4x²-12x-9+x²+1

=-12x+4