Question

If f(x) = 3x -5, then what's f(a)

Answer 1

put x=a

Answer 2

is a 1

Answer 3

that is: f(a) = 3(a)-5

Answer 4

what would it be???

Answer 5

What are you asking for? Can you explain exactly?

Answer 6

you are replacing x and replacing in it for x

Answer 7

A I meant

Answer 8

I replaced X with a

Answer 9

How would you show your work

Answer 10

For example: given f(x) =3(x)^2
Find f(a)

Answer 11

first of all replace X by a that is: f(a) = 3(a)^2

Answer 12

Just like this

Answer 13

is A like 1A

Answer 14

uh

Answer 15

"a" is just a different variable instead of "x". It's just a name... mostly, functions use 'x' but that's just a habit/tradition. The question wants you to see that it doesn't really matter... that a function of "a" looks just like the function of "x" -- you just replace all the x terms with an "a" in place of the "x".

Answer 16

So if f(x) = 2x, then f(a) = 2a, and f(y) = 2y and so on. The function "f" says, "take what is in the parenthesis and multiply it by 2"

Answer 17

so what would it be

Answer 18

If f(x) = 3x - 5 then
f(a) = 3a - 5

In this case, the function "f" just says , "take the thing in the parenthesis, multiply by 3, then subtract 5 from the answer"

It doesn't matter if you call the "thing in parenthesis" an "x" or an "a"