Question

10 use the following function rule to find f(4).
$f(x) = -5x + 7$
$f(4) = \square$

Explanation:

Step1: Substitute x = 4 into the function

To find \( f(4) \), we substitute \( x = 4 \) into the function \( f(x)=-5x + 7 \). So we get \( f(4)=-5\times4 + 7 \).

Step2: Calculate the value

First, calculate \( -5\times4=-20 \). Then, add 7 to -20: \( -20 + 7=-13 \).

Answer:

\( -13 \)