[tex]3x²-7+4[/tex]
[tex]3x {}^{2} - 3 [/tex]
[tex]3 \times (x {}^{2} - 1)[/tex]
[tex]eu \: \: a \: \: folosit \: \: formula \\ a {}^{2} - b {}^{2} = (a - b) \times (a + b)[/tex]
[tex]3 \times (x - 1) \times (x + 1)[/tex]
