Folosim proprietatea
[tex]x {}^{2} - y { }^{2} = (x - y)(x + y)[/tex]
(5m-1)(5m+1)
(7/5-a)(7/5+a)
(13/5x-2z)(13/5+2z)
(2/3x-3/10y)(2/3x+3/10y)
[tex] (\sqrt{7} - x)( \sqrt[]{7} + x)[/tex]
[tex](4x {}^{2} - 9y {}^{2} )(4x {}^{2} + 9y {}^{2} )[/tex]
[tex](4a {}^{2} - 3)(4a {}^{2} + 3)[/tex]
[tex](9x {}^{2} - 5)(9x {}^{2} + 5)[/tex]
[tex](9m {}^{4} - 4)(9m {}^{4} + 4)[/tex]
