1.(×+1) (×-1) 2.(2a+3) (2a-3) 3.(-2×+5) (-2×-5)

1.x²-1x+1x-1=x²-1
2.4a²-6a+6a-9=4a²-9
3.4x²+10x-10x-25=4x²-25
Kalo gak salah

1.
[tex] (x + 1)(x - 1) \\ {x}^{2} - 1x + 1x - 1 \\ {x}^{2} - 1[/tex]
2.
[tex](2a + 3)(2a - 3) \\ 4{a}^{2} - 6a + 6a - 6 \\ 4{a}^{2}-6[/tex]
3.
[tex]( - 2x + 5)( - 2x - 5) \\ 4{x}^{2} + 10x - 10x - 25 \\ 4{x}^{2}- 25[/tex]
Semoga membantu :)