[tex] \large f(x) = {x}^{2} - 3x + 5[/tex]

x = 3x - 1

[tex] \large f \rm(3x - 1) = {(3x - 1)}^{2} - 3(3x - 1) + 5[/tex]

[tex] \large f \rm(3x - 1) = {9x}^{2} - 6x + 1 - 9x +3 + 5[/tex]

[tex] \large f \rm(3x - 1) = {9x}^{2} - 6x - 9x + 1 +3 + 5[/tex]

[tex] \large f \rm(3x - 1) = {9x}^{2} - 15x + 4 + 5[/tex]

[tex] \large f \rm(3x - 1) = \boxed{ \blue{ \bold{ {9x}^{2} - 15x + 9}}}[/tex]