You are Here: Home >< Maths

# Help with this short core 1 question Watch

1. Its from edexcel jan 07

Its a long question about arithmetic progression but you end up with this

(3k-100)(k+35)<0

It asks to work out the value of k. (2 marks)

Why is it only one bracket that has been used though? Shouldn't the other bracket be used too to get an answer of -35?
2. (Original post by Insanity514)
Its from edexcel jan 07

Its a long question about arithmetic progression but you end up with this

(3k-100)(k+35)<0

It asks to work out the value of k. (2 marks)

Why is it only one bracket that has been used though? Shouldn't the other bracket be used too to get an answer of -35?
because the answer cannot be negative so you only consider the positive solution
(you can't have a negative number of rows)
3. (Original post by Insanity514)
Its from edexcel jan 07

Its a long question about arithmetic progression but you end up with this

(3k-100)(k+35)<0

It asks to work out the value of k. (2 marks)

Why is it only one bracket that has been used though? Shouldn't the other bracket be used too to get an answer of -35?
Well it depends on what "k" is supposed to represent. Most likely because it cannot be negative, but that's dependant on what "k" actually is.
4. Thanks guys

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: December 20, 2010
Today on TSR

### Oxford or Cambridge?

I just can't decide

### Should I move back home?

Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• 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

## Groups associated with this forum:

View associated groups
Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.