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Calculaţi:
f) (3x - 1)2 - 2(2x - 3)2 – 2(9x – 7).



Răspuns :

(3x-1)² - 2(2x-3)² - 2(9x-7) =

9x²-6x+1 -2(4x²-12x+9) - 18x+14 =

9x²-24x+15 -8x²+24x-18 =

x²-3