| (1) | | | | | | | | | | | | | | | | | | | | | | | | | ( | x | − | 7 | ) | ( | x | + | 7 | ) | + | ( | x | − | 10 | ) | ( | x | − | 1 | ) | | | | | | | | | | | | | | | | | | | | | | | | |
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| (2) | | | | | | | | | | | | | | | | | | | | | | | | | ( | w | + | 2 | ) | ( | w | − | 2 | ) | − | ( | w | + | 1 | ) | ( | w | + | 3 | ) | | | | | | | | | | | | | | | | | | | | | | | | |
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| (4) | | | | | | | | | | | | | | | | | | | | | | | | | ( | b | − | 7 | ) | ( | b | + | 7 | ) | + | ( | b | − | 2 | ) | ( | b | + | 3 | ) | | | | | | | | | | | | | | | | | | | | | | | | |
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| (5) | | | | | | | | | | | | | | | | | | | | | | | | | ( | a | − | 2 | ) | ( | a | + | 2 | ) | − | ( | a | + | 5 | ) | ( | a | + | 3 | ) | | | | | | | | | | | | | | | | | | | | | | | | |
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| (6) | | | | | | | | | | | | | | | | | | | | | | | | ( | 9 | x | + | 5 | ) | ( | −2 | x | + | 2 | ) | − | 3 | ( | 3 | x | + | 8 | ) | | | | | | | | | | | | | | | | | | | | | | | |
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| (7) | | | | | | | | | | | | | | | | | | | | | | | | | ( | b | − | 7 | ) | ( | b | + | 8 | ) | − | ( | b | − | 6 | ) | ( | b | + | 2 | ) | | | | | | | | | | | | | | | | | | | | | | | | |
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