Question

use the following function rule to find f(4).
f(x) = -2√x
f(4) =

Explanation:

Step1: Substitute $x=4$ into function

$f(4) = -2\sqrt{4}$

Step2: Calculate square root of 4

$\sqrt{4}=2$

Step3: Compute final value

$f(4) = -2\times2$

Answer:

$-4$