Question

If f(x)=4x+2, find f(3)

f(3)= ?

Answer 1

You have to just plug in

Answer 2

when f(#)
Its the same as f(x) because x is just a variable and so if its saying f(3) you just have yo plug in for x and solve

Answer 3

all this means is that every where there is an x you put a 3 =) then solve

Answer 4

x=4?

Answer 5

No you plug in x and solve

Answer 6

no
\[f(3)=4(3)+2\]

Answer 7

\[f(x)=f(3)\] they are the same so like kkutie7 placed it yea

Answer 8

you just use the number they give you to plug in and then continue to solve the equation using PEMDAS

Answer 9

i dont know how to solve it tho

Answer 10

@BinkyBoo

Answer 11

By using PEMDAS when you have f(x) its like having just another variable. Variables are just place holders for numbers that are not known yet, which if usually what you need to find

Answer 12

f=2 @BinkyBoo ?

Answer 13

Its like this for example
Find f(-15) for \[f(x)=9-4x\]
First you plug in
\[f(-5)=9-4(-5)\]
Then You Start PEMDAS
Since there is parenthesis but only one variable in them you move to exponents no exponents move to multiplication
\[f(-5)=9-(-20)\] Due to 4(-5)= -20
Then Two negatives multiplying together make a positive making the equation
\[f(-5)=9+20\]
Then Addition
\[f(-5)=29\]
And thats it!

Answer 14

whoops in the beginning that 15 was suppose to be a five I'm so sorry

Answer 15

is it 44 @BinkyBoo ?

Answer 16

Walk me through your steps

Answer 17

everything you did except 15

Answer 18

well i mixed up the problem a bit like you don't have the negative signs and everything

Answer 19

but its correct?

Answer 20

no not for your question