factorise the following algebric expression :-6 ( a + 3b )² - 3 ( a + 3b )
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6 (a+3b)² - 3 (a+3b)
= 3 (a+3b) [ 3 (a+3b) - 1 ]
= 3 (a+3b) ( 3a+9b-1) Ans.
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