Question

what is the domain?
f(x)=3(x-2)

just pretend the (stuff in here) is under the square root

Answer 1

you cant have a negative under a root for starters

Answer 2

that would be complex and imaginary.

Answer 3

it's not a negative, it's just x-2

Answer 4

yes i know but since it is domain we are looking at along the x axis
knowing that we cant have a negative will help us look at the domain.
so what is the lowest number we can put in for x that will keep it positive under the root

Answer 5

3?

Answer 6

lets try it.

Answer 7

yup that works but we can still go lower