You are Here: Home >< Maths

# Domain and range c3 question

Announcements Posted on
Would YOU be put off a uni with a high crime rate? First 50 to have their say get a £5 Amazon voucher! 27-10-2016
1. hi, I would like some help with Q6b and Q6c please. Since x >1 surely the biggest y value can only be 4/3 so for the range I got 0<f x <4/3 but the answer is x can't be 0 why ???

Cheers
2. (Original post by coconut64)
hi, I would like some help with Q6b and Q6c please. Since x >1 surely the biggest y value can only be 4/3 so for the range I got 0<f x <4/3 but the answer is x can't be 0 why ???

Cheers
Draw the graph, as x gets larger f(x) gets smaller, it tends to 0, but the fraction cannot equal 0, so there is an asymptote at y=0
3. (Original post by NotNotBatman)
Draw the graph, as x gets larger f(x) gets smaller, it tends to 0, but the fraction cannot equal 0, so there is an asymptote at x=0
Isnt the x asymptote at x=-1/2? Since it shifts to left by 1 then halved . ... The graph I drew indicates that all the y values can only be 4/3 to 0 as x>1. Thanks
4. (Original post by coconut64)
Isnt the x asymptote at x=-1/2? Since it shifts to left by 1 then halved . ... The graph I drew indicates that all the y values can only be 4/3 to 0 as x>1. Thanks
Sorry, I meant at y=0 , and the range of y values is less than 4/3 and greater than 0, so you've got it right.
5. to draw y = 4/ { 2x + 1 }

i) draw y = 1/x : you should know what this looks like.

ii) move it 1 unit left

iii) squash horizontally by a factor of 2

iv) stretch vertically by a factor of 4

*

## Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank
2. this can't be left blank
3. this can't be left blank

6 characters or longer with both numbers and letters is safer

4. this can't be left empty
1. Oops, you need to agree to our Ts&Cs to register

Updated: October 16, 2016
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Today on TSR

Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read here first

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams