What is the factored form of the expression? s^2-81

The factored form of the expression s^2-81 is (s-9)(s+9).

To find the factored form of the expression s^2 - 81, we can use the difference of squares formula. The difference of squares formula states that a^2 - b^2 can be factored as (a + b)(a - b).

In this case, a is s and b is 9. Therefore, the factored form of the expression s^2 - 81 is (s + 9)(s - 9).