Answer:
x = - 7, + 7
Explanation:
The denominator of h(x) cannot be zero as this would make h(x) undefined. Equating the denominator to zero and solving gives the values that x cannot be.
solve :
x² - 49 = 0 ⇒ (x - 7)(x + 7) = 0 ⇒ x = ± 7
The domain is valid for all x ∈ R , x ≠ - 7, + 7