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(2m - 5)^3
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(2m - 5 )³
( a-b )³ = a³ - b³ - 3a²b + 3ab² (2m - 5)³
= (2m) ³ - (5)³- 3(2)² (5) + 3(2m) (5)²
= 8m³- 125 - 60m² + 150m
= 8m³- 60m² + 150m- 125
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