23²-21³

To solve this problem, you need to perform the following calculations:

1. Calculate the square of 23:

23² = 23 * 23 = 529

2. Calculate the cube of 21:

21³ = 21 * 21 * 21 = 9,261

3. Subtract the cube of 21 from the square of 23:

529 - 9,261 = -8,732

Therefore, 23² - 21³ = -8,732.