Question

Factorise the following
4. 9a (6a - 5b) - 12a2 (6a -56)
6. 16(21 – 3m)2 - 12(3m - 21)
8. a? (x + y) + b2 (x + y) + (x + y)
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Answer 1

Answer:

I will tell you later. ..