[tex]a. \: {f}^{ - 1} (x) = \frac{7(x - 12)}{2} \\ b. \: {f}^{ - 1} (x) = {( \frac{x - 6}{9} )}^{2} + 27 \\ c. \: {f}^{ - 1} (x) = \sqrt{ \frac{x + 78}{35} } \: or \: {f}^{ - 1} (x) = - \sqrt{ \frac{x + 78}{35} } [/tex]
