Question

how to do this ?

What is the value of f(7) for the function f(x) = 4x + 3?

Answer 1

plug in 7 at each place where is x

Answer 2

47+3

Answer 3

?

Answer 4

yes, except 4x means 4 times x
so 4x+3 with x replaced by 7 means
4*x+3

Answer 5

4*7+3

Answer 6

31

Answer 7

how do i do this one
What is the value of f[g(3)] for the functions f(x) = x + 3 and g(x) = 2x + 1?

Answer 8

first do g(3), what do you get ?

Answer 9

idnt know how to set this one up

Answer 10

g(x) = 2x + 1

find g(3) means replace x with 3 (and remember 2x means 2*x)

Answer 11

3 + 3 and 2 x 3 +1 right

Answer 12

what did you get for g(3) ?

Answer 13

what do u mean

Answer 14

g(x) = 2x + 1

find g(3)

Answer 15

confused how do i do that

Answer 16

i thought g was 3

Answer 17

g(3) is short hand for " everywhere you see x in 2x+1, put in a 3 instead"

Answer 18

so 2*3 + 1

Answer 19

yes, but simplify that to get a number

Answer 20

what is 2 times 3 ? what is 2 times 3 and then add 1 ?

Answer 21

6 and add the one is 7

Answer 22

so g(3)=7

now f( g(3) ) is the same as f(7) (we replace g(3) with 7)

what is f(7) ?

remember f(x) = x + 3

Answer 23

so it would b 7 + 3?

Answer 24

i got confused on that part srry

Answer 25

yes that is right f(7) = 7+3

what is 7+3 ?

Answer 26

10

Answer 27

that is the answer

f(g(3))= 10

Answer 28

thnks man

Answer 29

what about this one

Given the domain values { -2, 0, 2 }, find the range values for the function y = 5x + 1.

Answer 30

dnt get it ?

Answer 31

you should make a new post for each question.

Answer 32

ok