23²-21³

To solve the expression 23² - 21³, we need to calculate the value of 23 squared and 21 cubed separately, and then subtract them.

23² = 23 x 23 = 529 21³ = 21 x 21 x 21 = 9261

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

So, 23² - 21³ = -8732.