NCERT Solutions for Class 9 Maths Chapter 2
Important NCERT Questions
Polynomials
NCERT Books for Session 2022-2023
CBSE Board and UP Board Others state Board
EXERCISE 2.5
Page No:49
Questions No:10 part:2
Without actually calculating the cubes, find the value of each of the following: (28)³ + (–15)³ + (–13)³
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Answer
=A+B+C=0 ={ 28-13-15} =0
=a³+b³+c³=3ABC
=3[28×{-13}×{-15} ]
=3[5460]
=16380