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Question
Find the sum of the following expressions
mn + t, 2mn – 2t, – 3t + 3mn
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Solution
(mn + t) + (2mn – 2t) + (– 3t + 3mn)
= mn + t + 2mn – 2t + (– 3t) + 3mn
= (mn + 2mn + 3mn) + (t – 2t – 3t)
= (1 + 2 + 3)mn + (1 – 2 – 3)t
= 6mn + (1 – 5)t
= 6mn + (– 4)t
= 6mn – 4t
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