Question

use the following function rule to find f(81).
f(x) = -6 + \sqrt{x}
f(81) = \square

Explanation:

Step1: Substitute $x=81$ into $f(x)$

$f(81) = -6 + \sqrt{81}$

Step2: Calculate the square root

$\sqrt{81} = 9$

Step3: Compute the final value

$f(81) = -6 + 9$

Answer:

3