Question

find the domain of the function: f(x)=to the square root of x2-64

Answer 1

x2-64 must be equal or greater than zero, that is:
x2-4 >=0
if you isolate x, then you end up with:
x>=sqrt(4)=2

so the domain is (2, + infinity)

Answer 2

Sorry

x2-64 must be equal or greater than zero, that is:
x2-64 >=0
if you isolate x, then you end up with:
x>=sqrt(64)=8

so the domain is (8, + infinity)

Answer 3

this are the following answers; a.(infinity,8) U (8,infinity) b. (-infinity, infinity), c. (-8,8) d, (-infinity,-8) U [8,infinity)( I don't see ur answer there)

Answer 4

let me check it out

Answer 5

yeah I was wrong. Remember that sqrt(64) =+8 and -8. So the domain is (-infinity,-8)U(8,+infinity)

Sorry

Answer 6

it is d)

Answer 7

yes!