Question 2 (ix)

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ab - 4a, 4b - ab, 4a - 4b

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Solution

ab - 4a, 4b - ab, 4a - 4b = ab - 4a + 4b - ab + 4a - 4b
= - 4a + 4a + 4b - 4b + ab - ab
= 0 + 0 + 0 = 0

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