Question

a+b, -4a – 5b, 5b – 6a, -7b​

Answer 1

a + b, - 4a – 5b, 5b – 6a, - 7b

= a + b - 4a – 5b + 5b – 6a - 7b
= a - 4a - 6a + b - 5b + 5b - 7b
= a - 10a + b - 7b
= - 9a - 6b
= -3 (3a + 2b)

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