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1 x2 + 7x + 12 = ________________________

2 x2 - 3x - 10 = _________________________

3 x2 - 25 = _________________________

4 x2 - 100 = ________________________

5 4x2 - 9 = _________________________

6 16x2 - 121 = _________________________

7 x2 + 6x - 24 = _________________________

8 x2 - y2 = _________________________

9 81 - x2 = _________________________

10 36x2 - 100y2 = _________________________

Factor each expression