The problem asks to evaluate the expression $81^2 - 80^2$.

1. Problem Description

The problem asks to evaluate the expression $81^2 - 80^2$.

2. Solution Steps

We can use the difference of squares formula to simplify the expression. The formula is:

$a^2 - b^2 = (a + b)(a - b)$

In this case, $a = 81$ and $b = 80$. Applying the formula, we have:

$81^2 - 80^2 = (81 + 80)(81 - 80)$

$81^2 - 80^2 = (161)(1)$

$81^2 - 80^2 = 161$

3. Final Answer

161