Let f ( x ) = 15 /x and g ( x ) = 2 x − 5 Find fg(4), gf(-30) and give the expression for gf(x)

Key here is the order of operation.g(4) =2x4 - 5=8-5=3fg(4) = f(3)=15/3=5gf(-30)f(-30)=15/-30=-1/2gf(-30)=g(-1/2)=2x-1/2 -5=-1-5=-6gf(x)f(x)=15/xg(15/x)=2*15/x -5=30/x -5

Answered by Eddie M. Maths tutor

4769 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

Show that the recurring decimal 0.0151515..=1/66 (4H)


write (3.2 x 10^4) - (5 x 10^3) in standard form


Solve this pair of simultaneous equations (1) 5x+2y=20 and (2) x+4y=13


Rearrange to make x the subject of the equation: 4(3x+y) = 12-2y


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences