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.
Add Comment
  • 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.
    Add Comment
  • Your Answer

    By posting your answer, you agree to the privacy policy and terms of service.