factorise `(2a + 3b)^(2) - (3a - 2b)^(2)` . 
factorise `(2a + 3b)^(2) - (3a - 2b)^(2)` . 
`(5a + b) (5a - b)`
`(a + 5b) (a - 5b)`
`(5a + b) (5b - a)`
`(5a + b) (5b + a)`
answer: c
solution: `(2a + 3b)^(2) - (3a - 2b)^(2)`   
 `= [2a + 3b + 3a - 2b] [2a + 3b - 3a + 2b]`   
 = `(5a + b) (5b - a)`   
 hence , the correct option is (c) . 
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