Question

f(x) = x + 1.
Part 1: Find f(2).
Part 2: Find x when f(x) = 2

Answer 1

Part 1: Plug in 2 for x in the equation
So, f(2)= 2+1
f(2)=3

Answer 2

So, f = 1.5?

Answer 3

Part 2: Set your equation f(x) equal to 2 and solve.
So, x+1=2
subtract 1 from the x to isolate x.
x=1

Answer 4

lolwut?

Answer 5

What do you not understand?

Answer 6

So, f(2) =3 then that would come out to be f = 1.5?

Answer 7

You are not solving for f.

Answer 8

So thats the answer?

Answer 9

f is the function, not a variable you want to find.

Answer 10

@Guez, "f" is a function, not a multplier... for this problem, it's a rule that says, if you give me "x", I will give you back "x + 1"

Answer 11

so if @Brittni0605 gives you x = 2, then your function gives back 2 + 1 = 3

Answer 12

f(2)=3 and when f(x)= 2 your x value equals 1

Answer 13

So the answers are..

Part 1 : f(2) = 3

Part 2 : x = 1

?

I understand how to do the first one but not the second one.

Answer 14

Yes, correct

Answer 15

Part 2 is like the reverse... you know your function gave back "2" as an answer... what must you have provided as an input to get "2" back?

Answer 16

For the second part, the question is asking what x value will make 'x+1' = 2

Answer 17

so lets say for part 2 it would have said Find x when f(x) = 4. The answer would have been x = 4?

Answer 18

No, the answer would be 3

Answer 19

If it said find f(x)=4:
x+1=4
x=4-1
x=3