the function f is such that f(x)=(2x-7)/4. Fnd f(-7) and the inverse of the function.

to find the first part we just need to plug in the value-7 in the expression for f replacing our independant value, x .f(-7)=(2*(-7)-7)/4 =(-14-7)/4 =-21/4to find the second part we need to interchange the position of x and y.here we set y as f(x). y=(2x-7)/4interchange their position: x=(2y-7)/4and then rearrange to make the new y the subject again. 4x=2y-74x+7=2y2x+7/2=yhence the invesrse function : f^-1(x)= 2x+7/2

EG
Answered by Emily G. Maths tutor

2724 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

You have a cubiod of dimension 2.2m by 1.8m by 2.0m, you have a pole of length 3m. Will the pole fit into the cuboid?


Prove that the difference of any two consecutive square numbers is odd


Factorise the following equation: x^2 + x - 6


What is the nth term of the sequence 5, 7, 9, 11....


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