Descopunand in factori expresia 9x la patrat -4y la pătrat obtinem

Răspuns :


[tex]9 {x}^{2} - 4 {y}^{2} = (3x - 2y)(3x + 2y)[/tex]
9x la patrat -4y la pătrat = (3x - 2y)(3x+2y)