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Factorise each of the following expressions.
(a) #x^2 - 4x - 32#
(b) #x^2 + 3x - 54#
(c) #x^2 + 2x + 1#
(d) #x^2+ 4x + 4#
(e) #x^2- 2x + 1#
(f) #x^2 - 14x + 49#