2a+6b-3(a+3b)^2

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Solution

2a + 6b - 3(a + 3b)^2
=2(a + 3b) - 3(a + 3b)(a + 3b)
=[2 - 3(a + 3b)](a + 3b)
=(2 - 3a - 9b)(a + 3b) ;which is the final solution.

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