Question

Which function's domain consists of all real numbers except 3?
a) f(x)=3x+3
b) f(x)=3/x-3
c) f(x)=3x^2
d) f(x)=3x-3
e) f(x)= 1/ square root of x-3

Answer 1

Look at the ones like f(x) = 3/(x-3) is it in brackets? If so, what makes the function undefined/ zero?

Answer 2

it's f(x)=3/x-3 , it's not in brackets.

Answer 3

well i mean is it

Answer 4

the second one

Answer 5

Yeah, so what happens if you plug in 3?

Answer 6

so are you saying the answer is B?

Answer 7

No, I'm asking you a question, what happens when you plug 3 for x?

Answer 8

The math question is like that, idk how to solve it.

Answer 9

Domain is the x values, so can you plug every number in this questions and get a solution? It's restricted if you have an undefined or it equals 0.

Answer 10

So you have f(3) = 3/(3-3) = 3/0 so this can't be all real numbers.

Answer 11

So what do you suggest is the answer?

Answer 12

You're looking for the functions that are undefined at x = 3.

Answer 13

So plug in x in the functions you're given and see if it's undefined, when you divide by 0 you get undefined.

Answer 14

do you understand?

Answer 15

You cannot have 0/x or x/0.