f(x)=x²-4 berapa f(x)–¹

f(x) = x² - 4
y = x² - 4
y + 4 = x²
[tex] \frac{+}{-} \sqrt{y+4} = x [/tex]
[tex]f^{-1}(x) = \frac{+}{-} \sqrt{x+4} [/tex]