1. Find (a) 8x3 +y3- 30xy+125if 2x +y =-5
  2. x3-27y3+27 if x =3y-3
  3. x2 - x - 110
  4. 15p2 - 7q2
  5. 7 root 2x - 10 x2 - 4 root 2

Refer the following link :1)
https://www.meritnation.com/ask-answer/question/i-would-like-to-know-how-to-factorise-this-125x3-27y3-8/polynomials/5481874  
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