#cube root

First take the last digit of a number:

eg: 13824 4 is the last digit

Find which number's cube root is 4. In this case it's 64. Last digit of 64 is 4. That means the last digit of our missing number is 4.

If its a 5 digit number take the first two digits. 4 digit or 3 digit take the first number. 13 is between 2 cubed ( 8 ) and 3 cubed ( 27 ). Therefore our number is between 20 and 30.

[Click here for a PDF version of this post] I saw a thumbnail of a cube root simplification problem on youtube, and tried it myself before watching the video. I ended up needing two hints from the video to solve the problem.  The problem was to simplify \begin{equation}\label{eqn:cuberootsimplify:20} x = \lr{ \sqrt{5} – 2 }^{1/3}. \end{equation} My guess was that the solution was of the…

Program in C++ to calculate square root and cube root

Square root is a number which produces a specified quantity when multiplied by itself. For example square root of 2 is 4. Cube root is the number which produces a given number when cubed. For example cube root of 3 is 27.

Here is the program.

 #include <iostream>

#include <math.h>

using namespace std;

int main()

{

float a,b,c;

cout<<“enter the number:”;

cin>>a;

b=sqrt(a);

c=pow(a,3);

cout<<“Sq…