Question

use the following function rule to find f(9).
f(x) = x² + 5
f(9) =

Explanation:

Step1: Substitute \( x = 9 \) into \( f(x) \)

We have the function \( f(x)=x^{2}+5 \). To find \( f(9) \), we replace \( x \) with 9 in the function. So we get \( f(9)=9^{2}+5 \).

Step2: Calculate \( 9^{2} \)

First, calculate \( 9^{2} \). We know that \( 9^{2}=9\times9 = 81 \).

Step3: Add 5 to the result

Now, add 5 to 81. So \( 81 + 5=86 \).

Answer:

\( 86 \)