Question

Considerando a função dada por f(x) = 25x+11, determine o valor de f^-1(61).

Answer 1

$f(x) = 25x + 11\\y = 25x + 11\\-25x = 11 - y\\25x = y - 11\\f^{-1}(y) = \frac{y - 11}{25} \\f^{-1}(61) = \frac{61 - 11}{25} \\f^{-1}(61) = \frac{50}{25} \\f^{-1}(61) = 2$