If the functions f and g are defined: f: x--> x/5 + 4 g : x--> 30x + 10. what is x, if fg(x) = x. ?? What would fgf(x) = x^2 be??

You should insert function g into function f. (30x + 10) / 5 + 4 = 0 6x + 2 + 4 = 0 6x + 6 = 0 x = -1
This is a more complex problem:You need to do a similar task but you should do it in steps.gf(x) = 30 (x/5 + 4) + 10gf(x) = 6x + 130fgf(x)= (6x+ 130)/5 +46/5 x + 30

6/5x + 30 = x1/5x = -30x= -150

LM
Answered by Lottie M. Maths tutor

3611 Views

See similar Maths A Level tutors

Related Maths A Level answers

All answers ▸

f(x)=ln(3x+1), x>0 and g(x)=d/dx(f(x)), x>0, find expressions for f^-1 and g


The probability function of a discrete random variable X is given by p(x)=x^2 x =1,2,3. Find E(X)


How do you take the derivative of a^x ?


You deposit 500 pounds at time t=0. At t=5 years, you have 800 pounds. The amount of money you have in the bank can be modeled as V(t)=A*(1+r)^t, where r is the interest rate. Find A and the interest rate r. After how many years will you have 1200 pounds.


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