You are Here: Home >< Maths

# How do i solve this equation?? C2 Watch

1. 4x-480x^-2=0
howq do i solve? step by step? Thanks all!
2. try multiplying by x^2
3. (Original post by Coulson72)
try multiplying by x^2
Okay sweet I got : 4x^3-480=0
4x^3=480
x^3=120
x= 3 root 120 = 4.9...
Thanks alot btw, but how do I choose what to multiply by if this was another q in an exam with different multiples...? Thanks though!!
4. well if you get summit similar try multiplying by enough to turn the biggest negative into a 0, so like if you have 2x^2+5x^-3=0 then you'd try multiplying by x^3 to turn the -3 into a 0
5. (Original post by alex7892)
Okay sweet I got : 4x^3-480=0
4x^3=480
x^3=120
x= 3 root 120 = 4.9...
Thanks alot btw, but how do I choose what to multiply by if this was another q in an exam with different multiples...? Thanks though!!
Well it's better to get rid of the fractions or negative power (by this I mean or ). So multiply by whatever you need to get rid of the negative power.
6. Thanks all great help. Love feeling confident about maths and getting it haha!!
7. (Original post by alex7892)
Okay sweet I got : but how do I choose what to multiply by if this was another q in an exam with different multiples...? Thanks though!!
Suppose you have been given permission to drive your friends car. You are given a large bunch of keys. How do you KNOW which key to use?

What would you do? I guess most people would try one key, then another and so on.

It's the same with mathematics. JUST try and see what happens.

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: April 22, 2012
Today on TSR

### 'Entry requirements are a form of elitism'

What do you think?

### Roommate kissed my boyfriend

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