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Question
Factorise : 3x3 – 45x2y + 225xy2 – 375y3
Sum
Solution
= 3x3 – 45x2y + 225xy2 – 375y3
= 3(x3 – 15x2y + 75xy2 – 125y3)
= 3(x3 – 3x2(5y) + 3x(5y)2 – (5y)3)
= 3(x – 5y)3
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