Factorise 2a + 6b - 3 (a + 3b)2.

2a + 6b – 3 (a + 3b)2

= 2 (a + 3b) – 3 [a + 3b]2

= – 3 [a + 3b]2 + 2 (a + 3b)

= (a + 3b) (- 3 (a + 3b) + 2)

= (a + 3b) (- 3a – 9b + 2)

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