Question

o Expond (2m + 1/5)3

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Answer 1

(2 m +  1/5)³

(a + b)³ = a³ + b³ + 3 ab ( a + b)

here a = 2 m and b = 1/5

(2 m +  1/5)³  = (2 m )³ + (1/5)³ + 3 × 2 m × 1/5 ( 2 m + 1/5)

(2 m +  1/5)³  = 8 m³ + 1/125 + 1.2 m (2 m + 1/5)

(2 m +  1/5)³  = 8 m³ + 1/125  + 2.4 + 0.24

(2 m +  1/5)³  = 8 m³ + 0.008 + 2.4 + 0.24

(2 m +  1/5)³  = 8 m³ + 2.648

hope it helps !!