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

4529 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

In a village the number of houses and the number of flats are in the ratio 7 : 4 the number of flats and the number of bungalows are in the ratio 8 : 5 There are 50 bungalows in the village. How many houses are there in the village?


Solve the following simultaneous equations: 3x+y-2z = -2, y+4z = 1, 10x+2y+5z=26


How do you expand and simplify (x − 6)(x + 2y)^2


Given that y is directly proportional to square root of x and that y = 20 when x = 49 find an expression to represent x and y.


We're here to help

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

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences