What Natural Numbers Solve the Equation from POTW #421?

  • MHB
  • Thread starter anemone
  • Start date
In summary, the identity equation for solving natural numbers is n = n, where n represents any natural number. To solve this equation, simply substitute any natural number for n. The identity equation is important in mathematics as it serves as a fundamental building block for solving more complex equations and establishing the concept of equality. However, it cannot be used to solve equations with variables. Other types of identity equations exist for integers, rational numbers, and real numbers, but they all follow the same concept - a quantity is equal to itself.
  • #1
anemone
Gold Member
MHB
POTW Director
3,883
115
Here is this week's POTW:

-----

Solve for natural numbers for the identity below:

$\dfrac{1^4}{x}+\dfrac{2^4}{x+1}+\dfrac{3^4}{x+2}+\cdots+\dfrac{10^4}{x+9}=3025$

-----

 
Physics news on Phys.org
  • #2
Congratulations to the following members for their correct solution! (Cool)

1. castor28
2. kaliprasad

Solution from castor28:
We use the fact that $\displaystyle\sum_{k=1}^n{k^3}=\frac{n^2(n+1)^2}{4}$.

For $x=1$, the LHS becomes:
$$
1^3 + 2^3 + \cdots + 10^3 = \frac{10^2\cdot 11^2}{4}=3025
$$

As this is the required value, $x=1$ is a solution. As the LHS is a decreasing function of $x$, this is the only solution.
 

Related to What Natural Numbers Solve the Equation from POTW #421?

1. What is the identity equation for solving natural numbers?

The identity equation for solving natural numbers is n = n, where n represents any natural number.

2. How do I use the identity equation to solve a problem?

To use the identity equation, you simply substitute the given value for n into the equation. This will result in the same value on both sides, showing that the equation is balanced and the solution is correct.

3. Can the identity equation be used for any type of number?

No, the identity equation is specifically for solving natural numbers. It may not work for other types of numbers, such as fractions or decimals.

4. Is the identity equation the only way to solve natural numbers?

No, there are other methods for solving natural numbers, such as using addition, subtraction, multiplication, or division. The identity equation is just one way to solve these types of problems.

5. Why is the identity equation important in mathematics?

The identity equation is important because it demonstrates the fundamental concept of equality in mathematics. It also serves as a starting point for solving more complex equations and can be used as a building block for understanding more advanced mathematical concepts.

Similar threads

  • Math POTW for Secondary and High School Students
Replies
1
Views
785
  • Math POTW for Secondary and High School Students
Replies
7
Views
1K
  • Math POTW for Secondary and High School Students
Replies
1
Views
815
  • Math POTW for Secondary and High School Students
Replies
1
Views
732
  • Math POTW for Secondary and High School Students
Replies
1
Views
902
  • Math POTW for Secondary and High School Students
Replies
1
Views
964
  • Math POTW for Secondary and High School Students
Replies
2
Views
955
  • Math POTW for Secondary and High School Students
Replies
1
Views
702
  • Math POTW for Secondary and High School Students
Replies
1
Views
1K
Back
Top