Find the inverse of: f(x) = (2x + 3)/(x - 4)

To find the inverse of a function, f-1(x):1) set f(x) as y: y =  (2x + 3)/(x - 4)2) swap x and y: x = (2y + 3)/(y -4)3) solve the new equation for y: x(y -4) = 2y + 3 = xy -4x2y - xy = -4x - 3y(2 - x) = -4x -3y = (-4x-3)/(2-x) = f-1(x)

SI
Answered by Sophie I. Maths tutor

4700 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

How do I solve the simultaneous equations 2x - y = 3 and 3x + y = 9


Make a the subject of the following equation, p=(3a+5)/(4-a)


Solve by factorisation. 3x^2 + 11x – 20 = 0


I don't understand how to solve quadratic inequalities?


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

MyTutor is part of the IXL family of brands:

© 2025 by IXL Learning