Question

For each function, what is the output of the given input?
For f(x) = 4x + 7, find f(4)

Please show work and give me an explanation. I am trying to study for my test with these practice problems. I'm not sure how to do this one. Please explain guys!! Will medal/fan as always.

Answer 1

f(x) is similar to f(4) but instead of x you see 4
so instead of the input being x
the input is now 4
just replace the x's with 4's
in the following:
f(x)=4x+7
so you have
f(4)=4(4)+7

Answer 2

our input is with f(x) and whatever answer to the function that was given with f(x) would be the output...

in other words, if we have \[f(x) = 3x + 1 \] and we are said to find f(2), what we have to do is replace the x in the function with 2.
\[f(2) = 3(2) + 1 \]
simply solve
\[3(2) + 1 = 6 + 1 = 7 \]

Answer 3

use that same principle with your problem, replace x with 4
\[\large f(4) = 4(4) + 7\]
find the sum of \[4(4) + 7 \] and that will be your output

Answer 4

did you get your answer ?

Answer 5

Hey guys. Just now got you answer. Let me read! :) hold on.

Answer 6

Thank you both! I wish I could give you both medals. :( Maybe you could medal each other? lol.