Question

(iii) a + b - 3, b - a + 3, a - b +3
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Answer 1

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