(iii) a + b - 3, b - a + 3, a - b +3
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Answer:
Add : a + b + 3
Subtract : -3a + 3b - 3
Step-by-step explanation:
Add or subtract?
Add :
= a + b - 3, b - a + 3, a - b +3
= a + b (- 3) + b (- a) + 3 + a (- b) + 3
= (a + a - a) + (b + b - b) + (3 + 3 - 3)
= a + b + 3
Subtract :
= a + b - 3 - b - a + 3 - a - b + 3
= (a - a - a) - (b - b - b) - (3 + 3 - 3)
= -3a - (-3b) - 3
= -3a + 3b - 3
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