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Sum
Factorise completely: 625 - x4
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Solution
625 - x4 = (25)2 - (x2)2
= (25 + x2) (25 - x2)
= (25 + x2) [(5)2 - (x)2]
= (25 + x2) (5 + x) (5 - x)
Concept: Factorising Completely
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