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x2 - 4
2. -9x2 + 6x - 6x + 4
-9x2 + 4
3. 25x2 + 10x - 10x - 4
25x2 - 4
4. -x2 - 2x - 3x - 6
-x2 - 5x - 6
5. 16a2 - 20ab + 20ab - 25b2
16a2 - 25b2
6. 4a2 + 6ab - 6ab - 9b2
4a2 - 9b2