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

# expanding quadratics help watch

1. first question:
expand (3x-1)(2x+3)
= 6x^2+7x-3
then Im asked to show how I can use my answer to work out 29 * 23:
how am I supposed to do that?
Any help would be appreciated. Thanks In advance
2. (Original post by coatsoft)
first question:
expand (3x-1)(2x+3)
= 6x^2+7x-3
then Im asked to show how I can use my answer to work out 29 * 3:
how am I supposed to do that?
Any help would be appreciated. Thanks In advance
I suspect a typo, and they really want 29 * 23.

Looking at the factorisation, what might be a suitable choice for x?
3. (Original post by ghostwalker)
I suspect a typo, and they really want 29 * 23.

Looking at the factorisation, what might be a suitable choice for x?
god been looking through my notes and had read a number wrong. My writings so bad. x = 10
4. (Original post by coatsoft)
god been looking through my notes and had read a number wrong. My writings so bad. x = 10
Yep. And just put that into the quadratic, which is easy to work out with x=10.

Reply
Submit reply
Turn on thread page Beta
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: May 11, 2014
Today on TSR

### Cambridge decisions

Support and chat here

### University open days

• University of East Anglia
All Departments Open 13:00-17:00. Find out more about our diverse range of subject areas and career progression in the Arts & Humanities, Social Sciences, Medicine & Health Sciences, and the Sciences. Postgraduate
Wed, 30 Jan '19
• Solent University
Careers in maritime Undergraduate
Sat, 2 Feb '19
• Sheffield Hallam University
City and Collegiate Campus Undergraduate
Sun, 3 Feb '19
Poll
Useful resources

## Make your revision easier

### 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

Can you help? Study help unanswered threads

## Groups associated with this forum:

View associated groups

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

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