1. Expand.
(1) (2m - 5)3
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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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