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(2x-3)(2x+7)+4(x-1)^2+8(x-1 )

Răspuns :

(2x-3)(2x+7)+4(x-1)²+8(x-1)=
=4x²+14x-6x-21+4(x²-2x+1)+8x-8=
=4x²+8x-21+4x²-8x+4+8x-8=
=8x²+8x-25