If m-5n=2, then the value of (m³ – 125n³ – 30mn) is:

  1. 8
  2. 9
  3. 6
  4. 7
Monis Rasool Professor Asked on 28th August 2015 in Maths.
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1 Answer(s)

Answer: (1) 8
Explanation:-
m -5n = 2
Cube on both side,
(m – 5n)3 = 23                    ……………… (1)
m3 – 125n3 – 3 x m x 5n (m – 5n)
m3 – 125n3 – 15mn x 2  = 8                    (From equation 1)
m3 – 125n3 – 30 mn = 8
Then, the value of (m3 – 125n3 – 30mn) is 8.
Hence, the answer is (1) 8.

Anurag Mishra Professor Answered on 28th August 2015.
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