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Factorise 81x^2 + 90x + 25

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Factorise 81x2 + 90x + 25

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81x2 + 90x + 25 = (9x)2 + 2 (9x) (5) + 52 

= (9x + 5)2 [∵ a2 + 2ab + b2 = (a + b)2]

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