Round #559

Calculate 25 squared minus 24 squared.

To calculate 25 squared minus 24 squared, we can use the formula: a² - b² = (a + b)(a - b) In this case, a = 25 and b = 24. So, 25² - 24² = (25 + 24)(25 - 24) = 49 * 1 = 49 Therefore, 25 squared minus 24 squared is 49. Here is the C# code to calculate this: ```csharp using System; class Program { static void Main() { int a = 25; int b = 24; // Using the formula a² - b² = (a + b)(a - b) int result = (a + b) * (a - b); Console.WriteLine("25 squared minus 24 squared is: " + result); } } ``` When you run this code, it will output: 25 squared minus 24 squared is: 49

```csharp using System; class Program { static void Main() { int a = 25; int b = 24; // Calculate the difference of squares using the formula (a + b) * (a - b) int result = (a + b) * (a - b); Console.WriteLine(result); } } ``` This C# program calculates the difference of squares between 25 and 24 using the formula `(a + b) * (a - b)`, which is equivalent to `a^2 - b^2`. The result is then printed to the console. The formula is used to avoid calculating the squares separately, which can be less efficient for large numbers.