Answer :

(2m – 5)3 =(2m)3 – [ 3 ×(2m)2 × 5 ] + [ 3 ×(2m)×(5)2] –(5)3


{ (a – b)3 = a3 – 3a2b + 3ab2 – b3


Here a = 2m, b = - 5 }


= 8m3– [ 3 × 4m2 × 5 ] + [ 3 × 2m × 25] 125


= 8m3 – 60m2 + 150m – 125


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