Question

expand (2m-5)^3
please expand the following equation.
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Answer 1

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