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5x(3xla patrat-2x+4)-(x-3)la pătrat
Dau coroana!


Răspuns :

Rezolvare :
[tex]5x(3x {}^{2} - 2x + 4) - (x - 3) {}^{2} = 15x {}^{3} - 10x {}^{2} + 20x - (x {}^{2} - 6x + 9) = 15x {}^{3} - 10x {}^{2} + 20x - x {}^{2} + 6x - 9 = 15x {}^{3} - 11x {}^{2} + 26x - 9[/tex]