My Math Forum  

Go Back   My Math Forum > High School Math Forum > Algebra

Algebra Pre-Algebra and Basic Algebra Math Forum


Thanks Tree2Thanks
  • 2 Post By topsquark
Reply
 
LinkBack Thread Tools Display Modes
August 13th, 2018, 11:38 PM   #1
Newbie
 
Joined: Aug 2018
From: HK

Posts: 15
Thanks: 0

Function and graph (2)

How can I calculate

if g(x+1)=2x+3, find g(x)


Please help, with details, thank you!!
hy2000 is offline  
 
August 13th, 2018, 11:42 PM   #2
Math Team
 
topsquark's Avatar
 
Joined: May 2013
From: The Astral plane

Posts: 1,888
Thanks: 765

Math Focus: Wibbly wobbly timey-wimey stuff.
Quote:
Originally Posted by hy2000 View Post
How can I calculate

if g(x+1)=2x+3, find g(x)


Please help, with details, thank you!!
Let u = x + 1. Then x = u - 1. So
g(x + 1) = 2x + 3

g(u) = 2(u - 1) + 3

g(u) = 2u - 2 + 3

g(u) = 2u + 1

Now for the cheat code.... The variable in the equation can be any variable we like. So let it be "x"

g(x) = 2x + 1

-Dan
Thanks from greg1313 and hy2000
topsquark is offline  
August 14th, 2018, 12:02 AM   #3
Newbie
 
Joined: Aug 2018
From: HK

Posts: 15
Thanks: 0

Thank you!!
hy2000 is offline  
Reply

  My Math Forum > High School Math Forum > Algebra

Tags
function, graph



Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
Function and graph hy2000 Algebra 7 August 13th, 2018 11:45 PM
Graph of function. jiasyuen Algebra 2 February 4th, 2014 07:58 AM
function graph safyras Algebra 1 January 2nd, 2012 12:22 PM
Function: Graph ChristinaScience Calculus 7 October 9th, 2011 11:35 AM
Graph of function mikeportnoy Algebra 3 March 10th, 2009 06:35 AM





Copyright © 2018 My Math Forum. All rights reserved.