If f(x) = x + 5, what does f(8) represent?

The value if x when (x + 5) = 8
The value of 8f(x) when x = 8
The value of f(x) when (x + 5) = 8
The value of (x + 5) when x = 8

Question

If f(x) = x + 5, what does f(8) represent?

 The value if x when (x + 5) = 8
 The value of 8f(x) when x = 8
 The value of f(x) when (x + 5) = 8
 The value of (x + 5) when x = 8

sleepyjess · Answer

What do you think?

mehek14 · Answer

That is easy

sleepyjess · Answer

It may be easy for you, but they may be clueless.

mehek14 · Answer

f(x) = y
so technically f(8) is the same as 8 = x+5

adamaero · Answer

It's all about inputs and outputs...

adamaero · Answer

https://en.wikipedia.org/wiki/Function_(mathematics) (see the picture)

sleepyjess · Answer

That is incorrect @Mehek14 . I will give an example so I am not giving the answer away. f(x) = 2x +7. Find the value for f(4). f(4) = 2(4) + 7

mehek14 · Answer

oh yea forgot about the x

sleepyjess · Answer

Therefore, f(4) for that expression is f(4) = 15

anonymous · Answer

ok

mehek14 · Answer

I didn't put it so that the person doesn't get confused by the answer choices

sleepyjess · Answer

With that example, what do you think @hiiguess? ?

anonymous · Answer

b?

sleepyjess · Answer

Not quite, for f(8), all you do is substitute in 8 for x.

anonymous · Answer

d then

sleepyjess · Answer

Yep :) Good job

sleepyjess · Answer

Could you please close this?

anonymous · Answer

ok