Question
Add:
3a - 2b + 5c, 2a + 5b - 7c, - a - b + c
3a - 2b + 5c, 2a + 5b - 7c, - a - b + c
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Answer
3a - 2b + 5c, 2a + 5b - 7c, - a - b + c
= 3a - 2b + 5c, 2a + 5b - 7c, -a - b + c
= (3a + 2a - a) - (2b - 5b + b) + (5c - 7c + c)
= 4a - (3b - 5b) + (6c - 7c)
= 4a + 2b - c
= 3a - 2b + 5c, 2a + 5b - 7c, -a - b + c
= (3a + 2a - a) - (2b - 5b + b) + (5c - 7c + c)
= 4a - (3b - 5b) + (6c - 7c)
= 4a + 2b - c
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