jika di ketahui f(x) = x kuadrat - 2x + 1, maka fungsi invers (4) adalah

[tex]f(x) = {x}^{2} - 2x + 1 \\ {f}^{ - 1} (4) = ... \\ misal \: f(x) = y \\ {x}^{2} - 2x + 1 = y \\ ( {x - 1)}^{2} = y \\ x - 1 = \sqrt{y} \\ x = \sqrt{y} + 1 \\ {f}^{ - 1} (x) = \sqrt{x} + 1 \\ {f}^{ - 1} (4) = \sqrt{4} + 1 = 3[/tex]