factorise ( 5a -3b)^3
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Step-by-step explanation:
( a - b )³ = a³ - b³ - 3ab ( a - b )
( 5a -3b)³ = ( 5a )³ - (3b)³ - 3 * 5a ( 5a - 3b )
= 125a³ - 27b³ - 75a² + 45ab
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