Răspuns:
[tex]15x {}^{2} + 7x - 2 \\ = 15x {}^{2} + 10x - 3x - 2 \\ = 5x(3x + 2) - 3x - 2 \\ = 5x(3x + 2) - (3x + 2) \\ =( 3x + 2)(5x - 1)[/tex]
