factorise :-
9a²+ba+1-36 b ^2
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Answer:
9a² + 6a + 1 - 36b²
[9a²+6a+1] -[36b²]
using indentity (a+b)² = a²+b²+2ab
[3a+1]² - [6b]²
again using indentity
a²-b² = (a-b) (a+b)
(3a+1+6b) (3a+1-6b)
i hope this helps you
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