x Turn on thread page Beta
 You are Here: Home >< Maths

# Find the set of values for mod(x-5) < mod(3x-2) watch

1. So I have the correct answer.

But there are two intersects, and you get 4 possible x values in solving

x< -3/2 or x> 7/4

How am I supposed to fiugre out how to solve the x values (i.e. which ones do I choose).

I had to draw the graph, work out the intersect points - but surely I should know what I am looking for before hand?

i can upload my work if anoynoe wants, but since there are 4 possible x values how do i go about selecting the right ones in future
2. Why not just put them all back in to the original equation?
3. (Original post by Student403)
Why not just put them all back in to the original equation?
there is that I suppose, can't believe I forgot to do that. But surely when solving these questions, people know where to make the bracket negative, if you know what I am saying.
4. (Original post by Mihael_Keehl)
there is that I suppose, can't believe I forgot to do that. But surely when solving these questions, people know where to make the bracket negative, if you know what I am saying.
No I seem to remember just plugging all in to the original or sketching the graph to see when I did C4
5. (Original post by Student403)
No I seem to remember just plugging all in to the original or sketching the graph to see when I did C4
I see. Thanks.
6. (Original post by Mihael_Keehl)
I see. Thanks.
You're welcome
7. (Original post by Student403)
Why not just put them all back in to the original equation?
it is an inequality
8. (Original post by the bear)
it is an inequality
9. (Original post by Student403)
10. (Original post by the bear)
it is an inequality
kek just semantics haha
11. (Original post by the bear)
Haven't seen you trigger so much in a day!

12. (Original post by Mihael_Keehl)
kek just semantics haha
anyway... i always prefer to draw the graph first to see what is happening. as you say there are 2 intersections. we want the shallow V graph to lie below the steep V graph...
13. (Original post by Student403)
Haven't seen you trigger so much in a day!

14. (Original post by the bear)
anyway... i always prefer to draw the graph first to see what is happening. as you say there are 2 intersections. we want the shallow V graph to lie below the steep V graph...
I did do this.

But when you solve algreabraically for x there are 4 possible values which x satisfies, I wonder is there a way to know which ones to look for prior to actually working out the values.
15. (Original post by Mihael_Keehl)
I did do this.

But when you solve algreabraically for x there are 4 possible values which x satisfies, I wonder is there a way to know which ones to look for prior to actually working out the values.
i expect if you are genius you can figure it out... us lesser mortals need a pic
16. (Original post by the bear)
i expect if you are genius you can figure it out... us lesser mortals need a pic
ah okay thnx

17. (Original post by Mihael_Keehl)
ah okay thnx

Nice calculator
18. (Original post by Student403)
Nice calculator
lolz that one is fx-991DE Plus
Spoiler:
Show
its in german
19. (Original post by Mihael_Keehl)
lolz that one is fx-991DE Plus
Spoiler:
Show
its in german
Oops lol - I use the fx-115ES PLUS
20. (Original post by Student403)
Oops lol - I use the fx-115ES PLUS
is that better mine/better than fx991-es

I also have a ti84 + c silver calcualsatos

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:
Updated: January 30, 2016
Today on TSR

### How much will your degree earn you?

Find out where yours ranks...

Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams