Question

Determine the domain of the function f(x) = 2x - 4 when the range is {0, 12, 20}.



{2, 8, 12}


{0, 12, 20}


{4, 16, 24}


none of these

Answer 1

domain= x values
range = y values

Answer 2

so substitute y for given set {0,12,20)one by one to find domain

Answer 3

how ?

Answer 4

you need to solve for them and not guess

Answer 5

f(x) is same as y
so \[\huge\rm y=2x-4\]
start with first number 0
substitute x for 0
what do you get ?

Answer 6

\(\color{blue}{\text{Originally Posted by}}\) @Nnesha
f(x) is same as y
so \[\huge\rm y=2x-4\]
start with first number 0
substitute x for 0
what do you get ?
\(\color{blue}{\text{End of Quote}}\)
i meant substitute y**8

Answer 7

no no no
you do not substitute x for 0
you substitute f(x) to each the values in the range. you said it yourself y = f(x)
range = y
domain = x

so,
\(f(x) = 2x - 4 \)
means solve for x for each of the following:

\(0 = 2x-4 \)

\(12 = 2x-4 \)

\(20 = 2x-4 \)

Answer 8

if you do not know how to solve for x, then you have no business taking the course.

Answer 9

\(\color{blue}{\text{Originally Posted by}}\) @Nnesha
\(\color{blue}{\text{Originally Posted by}}\) @Nnesha
f(x) is same as y
so \[\huge\rm y=2x-4\]
start with first number 0
substitute x for 0
what do you get ?
\(\color{blue}{\text{End of Quote}}\)
i meant substitute y**
\(\color{blue}{\text{End of Quote}}\)
^^^^^

Answer 10

x = 2
x=8
x=12

Answer 11

how did you GET those values?
CAN YOU SHOW YOUR SOLUTION FOR EACH?

Answer 12

0=2x−4
2x−4+4=0+4
2x=4
2x/2 = 4/2
x=2

Answer 13

12=2x-4
2x−4+4=12+4
2x=16
2x/2 = 16/2
x=8

Answer 14

20=2x-4
2x−4+4=20+4
2x=24
2x/2 = 24/2
x=12

Answer 15

happy? fgt.

Answer 16

PERFECT!
great job!! :=)

Answer 17

fgt????

Answer 18

ty Nnesha.

Answer 19

yw