Question

what is the value of the function when x=5? f(x)=-3x

Answer 1

We are given the following function:

$f(x)=-3x$

We are asked for the value of the function at x = 5. To do that, we need to replace the given value of "x" in the function, like this:

$\begin{gathered} f(5)=-3(5) \\ f(5)=-15 \end{gathered}$

Therefore, at x = 5, the function is -15