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(3x+1)^2+2(x+1)(x-1)-3(2x-5)^2

Răspuns :

=9x^2+6x+1+2x^2+2-12x^2+20x-75
=-x^2+26x-72
(3x+1)^2+2(x+1)(x-1)-3(2x-5)^2 =
9x^2+6x+1+2(x^2-1)-3(4x^2-20x+25) =
9x^2+6x+1+2x^2-2-12x^2+60x-75 =
-x^2+66x-76.


J'espère aidé :)