= 36x2 - 81 (x-3) 2
= (6x)2 - (9(x-3)) 2
= (6x - 9(x-3) ) ( 6x + 9(x-3) )
= (6x - 9x + 27) ( 6x + 9x -27)
=(27 - 3x) (15x - 27)
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