factorise a square + 2 a b + b square minus 9c square
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a square + 2 a b + b square = (a + b) square
=> (a+b) square - 9c square
=> (a+b) square - (3c) square
=> USING a square - b square = (a+b)(a-b)
taking a = (a+b)
b = 3c
ANS. = (a + b + 3c) (a + b - 3c)
=> (a+b) square - 9c square
=> (a+b) square - (3c) square
=> USING a square - b square = (a+b)(a-b)
taking a = (a+b)
b = 3c
ANS. = (a + b + 3c) (a + b - 3c)
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