23²-21³

To solve this problem, we need to calculate 23² and 21³ separately and then subtract the result.

First, let's calculate 23²: 23² = 23 × 23 = 529

Next, let's calculate 21³: 21³ = 21 × 21 × 21 = 9261

Now, subtract 21³ from 23²: 23² - 21³ = 529 - 9261 = -8732

Therefore, 23² - 21³ is equal to -8732.