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Question
What should be subtracted from 2a + 8b + 10 to get - 3a + 7b + 16?
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Solution
Let p be the required term.
(2a + 8b + 10) - p = - 3a + 7b + 16
p = 2a + 8b + 10 - (-3a + 7b + 16)
= 2a + 8b + 10 + 3a - 7b - 16
= 2a + 3a + 8b - 7b + 10 - 16
= 5a + b - 6
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