f(1) = √2 +9. Find f¹(x) and its domain.
O A. f¹ (2) = (1 - 9)²; xz0
-1
O B. ƒ¹ (x) = x² - 9; x²0
O c. f¹(x) = x² - 9; x≥ 9
OD. f¹(x) = (r - 9)²; xz 9