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(x+5)(2x-3)-2x(x+4)+(x-2)(x-3)=?

Răspuns :

(x+5)(2x-3)-2x(x+4)+(x-2)(x-3) =
(2x²-3x+10x-15)-(2x²+8x)+(x²-3x-2x+6) =
2x²+7x-15-2x²-8x+x²-5x+6=
x²-6x-9