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(2x-1)² - x² - (x-1)²

Răspuns :

^ inseamna la putere
4x^2-4x+1-x^2-x^2+2x-1 = 2x^2-2x
(2x-1)² - x² - (x-1)² =

= 4x
²-4x+1-x²-(x²-2x+1 ) =

= 4x²-4x+1-x²-x²+2x-1 =

=2x²-2x