Find the domain of the function f(x) = sqrt(sqrt(x^2 - 16) + 3).
x^2 - 16 needs to be > = 0 first of all ( no sqrt of a negative)
THEN sqrt(x^2-16) also needs to be >= 0
x^2 >= 16
x >= 4 <= -4 so far -4 >=x>=4
These values will result in a positive sqrt .....adding +3 will still be a positive sqrt