2. Questions Bank
  3. 8th Class
  4. Mathematics
  5. Cubes and Cube Roots

8th Class Mathematics Cubes and Cube Roots Question Bank Cube and Cube Roots

  • question_answer
    There are two numbers such that the sum of the numbers is 28 and their difference is 4. Find the difference of their cubes.

    A)  2368

    B)  1529         

    C)  2068                           

    D)  1638

    Correct Answer: A

    Solution :

    (a): \[x+y=28.\] \[x-y=4\] \[\Rightarrow x=16,y=12\] \[{{x}^{3}}-{{y}^{3}}={{16}^{3}}-{{12}^{3}}\]             \[=4096-1728\]  \[=2368\].


You need to login to perform this action.
You will be redirected in 3 sec spinner