Descompuneți in factori:
1. (3x+5)^2-(x+1)^2
2. (2x+5)^2-(3x-1)^2
3. (4x+1)^2-(2x-7)^2
4. 9(x+1)^2-(x+2)^2
5. 36(x+2)^2-25(x-1)^2
6. 4(5x+3)^2-25(x+2)^2
