Question

the domain of 7

Answer 1

minimum value of \[x^2+8=8,i,e.,when~x=0\]
so range=-24/8=-3
so range is [-3,0)

Answer 2

is this in your options?

Answer 3

sorry ,i told you the range.
you asked domain
you can give any real value to x.

Answer 4

x^2 is always positive for any real value
denominator is always >=8
so f(x)is defined for all real values

Answer 5

now you can give the answer.