Question

math problem

Answer 1

@AZ

Answer 2

so, it's a pretty straightforward question

you know how we write equations like

y = 5x + 5

but then we can also write it as

f(x) = 5x + 5

f(x) is the same thing as y except that we're saying it's a function

Answer 3

so let's say we want to plug in x = 4

then you write that as f(4)

basically- f(4) is the y-value when x = 4

Answer 4

so for your question, they want to know what f(8) is

so what is the y-value when x = 8

Answer 5

8?

Answer 6

no, you understand that f(x) is the same thing as 'y' right?

so f(x) has that x inside

when we replace that `x` with a number- then that means we're looking for the y-value when x is that number

so f(8) means the y-value when x is 8

so you have to look at your table for when x is 8
and then see the corresponding f(x) value when x is 8

Answer 7

f(8)?

Answer 8

y and x are 8?

Answer 9

no

x is 8
what is y when x = 8

Answer 10

look at the table they provided you

do you see how they list out different x-values and the y-values (or f(x)) for when x is a certain number?

so you have to use that table

f(8) means what is f(x) when x = 8

Answer 11

1

Answer 12

or 3

Answer 13

I don't think you're understanding

Let me re-write the table

\(\begin{array}{|l|l|}\hline
\sf{x}&\sf{f(x)}\\\hline
\sf{-2}&\sf{11}\\\hline
\sf{0}&\sf{4}\\\hline
\sf{1}&\sf{8}\\\hline
\sf{3}&\sf{8}\\\hline
\sf{5}&\sf{-4}\\\hline
\sf{8}&\sf{5}\\\hline
\end{array}\)

What is f(x) when x is 8

what is the number right next to it?

Answer 14

5

Answer 15

There you go!!

Does that make sense?

Think of f(x) as the same thing as y
We have f(8)
it has the number 8 in it
that means x = 8
so we're looking for the y-value for when x is 8

Answer 16

yep