Question

use the following function rule to find f(75).
f(x) = 5\sqrt{25 + x}
f(75) = \square

Explanation:

Step1: Substitute x=75 into function

$f(75) = 5\sqrt{25 + 75}$

Step2: Simplify inside the square root

$25 + 75 = 100$, so $f(75) = 5\sqrt{100}$

Step3: Calculate square root and multiply

$\sqrt{100}=10$, so $f(75)=5\times10$

Answer:

50