Add and Subtract: |
(a) m - n, m + n |
(b) mn + 5 - 2, mn + 3. |
Answer:
(a) (m - n) + (m + n) = m - n 4- m + n = m + m ? n + n = (1 + l) m+ (-1+ 1)71 = 2m And, (m - n) - (m + n) = m ? n ? m - n = m ? m ? n - n = (1 - l)m + (- 1 - l)n = 0m+ (-2)n (b) (mn + 5 - 2) + (mn + 3) = (mn + 3) + (mn + 3) = 2mn + 6 (mn + 5-2) - (mn + 3)=(mn + 3) - (mn + 3)= 0
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