| (1) | | | | | | | | | | | | | | | | | | | | | | | | | | | | | ( | − | x | − | 3 | ) | ( | −3 | x | − | 7 | ) | − | ( | −3 | x | + | 7 | ) | ( | −7 | x | − | 8 | ) | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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| (2) | | | | | | | | | | | | | | | | | | | | | | | | | ( | y | − | 6 | ) | ( | y | − | 3 | ) | + | ( | y | − | 7 | ) | ( | y | + | 2 | ) | | | | | | | | | | | | | | | | | | | | | | | | |
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| (3) | | | | | | | | | | | | | | | | | | | | | | | | | ( | z | + | 2 | ) | ( | z | + | 9 | ) | − | ( | z | − | 8 | ) | ( | z | + | 8 | ) | | | | | | | | | | | | | | | | | | | | | | | | |
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| (5) | | | | | | | | | | | | | | | | | | | | | | | | | ( | r | + | 7 | ) | ( | r | − | 5 | ) | − | ( | r | + | 2 | ) | ( | r | − | 3 | ) | | | | | | | | | | | | | | | | | | | | | | | | |
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| (6) | | | | | | | | | | | | | | | | | | | | | | | | ( | −8 | x | + | 5 | ) | ( | 7 | x | + | 2 | ) | − | 4 | ( | 8 | x | + | 2 | ) | | | | | | | | | | | | | | | | | | | | | | | |
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| (7) | | | | | | | | | | | | | | | | | | | | | | | | | ( | c | + | 7 | ) | ( | c | − | 2 | ) | − | ( | c | − | 2 | ) | ( | c | − | 8 | ) | | | | | | | | | | | | | | | | | | | | | | | | |
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