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Can anyone factorise 9a²- c²+4cx- 4x²

9 a^{2} - c^{2} + 4 c x - 4 x^{2} = 9 a^{2} - [c^{2} - 4 c x + 4 x^{2}] = 9 a^{2} - [{(c)}^{2} - 2 (c) (2 x) + {(2 x)}^{2}] = 9 a^{2} - {[c - 2 x]}^{2} = {(3 a)}^{2} - {(c - 2 x)}^{2} = (3 a + c - 2 x) (3 a - c + 2 x)

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