Cube of any digit, forms by multiplying the digit by itself three times. For instance, to find the cube of 5, i.e. 53,we need to multiply 5 three times: 5 × 5 × 5 = 125
Note:We can write “5 cube” as \(\begin{array}{l}5^{3}\end{array} \)
The Cube Formula for any value ‘x’ is given as,
\[\LARGE x^{3} = x \times x \times x\]
In algebra, cube refers to a number raised to the power 3. However, the meaning of cube is different in geometry, i.e. cube is a 3d shape with equal measure of edges and all the faces are squares.
Based on this, we can also write the volume of cube formula since cube has equal length, breadth and height.
Length = Breadth = Height = a
Thus, the measure of each edge of the cube = a
Therefore, the volume of cube formulais a× a× a = a3.
It is to be noted that the number obtained using cube formula is the perfect cube number.
Solved Examples
Question1:
What is the cube of 15?
Solution:
The formula for calculating cube is,
\(\begin{array}{l}x^{3} = x \times x \times x\end{array} \)
Here, x = 15
\(\begin{array}{l}15^{3} = 15 \times 15 \times 15\end{array} \)
Therefore,
\(\begin{array}{l}15^{3} = 3375\end{array} \)
Question2:
What is the value of x if
\(\begin{array}{l}x^{3}=27\end{array} \)
?
Solution:
The formula for calculating cube is,
\(\begin{array}{l}x^{3} = x \times x \times x\end{array} \)
Here,
\(\begin{array}{l}x^{3}=27\end{array} \)
\(\begin{array}{l}x=\sqrt[3]{27}\end{array} \)
Therefore,
\(\begin{array}{l}x = 3\end{array} \)
| More topics inCube Formula | |
| Volume of Cube Formula | |
| Difference of Cubes Formula | |
