9.  Factorise using identities

1 .     4 a 2 - 4 a + 1 2 .     x 3 - 25 x 3 .   80 a 2 - 45 b 2 4 .   36 a 2 - x - y 2 5 .   x 4 - y 4 6 .   16 ( 2 x - 1 ) 2 - 25 z 2

Hi, 80a2-45b2= 516a2-9b2= 54a2-3b2we know that x2-y2= x-yx+yso here = 54a-3b4a+3b

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