Tentukan invers dari f (x)=x^2-8x+15

[tex]f(x) = {x}^{2} - 8x + 15 \\ misal \\ {x}^{2} - 8x + 15 = y \\ {(x - 4)}^{2} - 1 = y \\ {(x - 4)}^{2} = y + 1 \\ x - 4 = \sqrt{y + 1} \\ x = \sqrt{y + 1} + 4 \\ {f}^{ - 1} (x) = \sqrt{x + 1} + 4[/tex]