Sum
Factorise: (5a - 3b)2 - 16b2
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Solution
(5a - 3b)2 - 16b2
= (5a - 3b)2 - (4b)2
= (5a - 3b + 4b) (5a - 3b - 4b)
= (5a + b) (5a - 7b)
Concept: Factorisation by Difference of Two Squares
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