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

# Fp1 question driving us nuts watch

1. RIGHT, the equation, x^3+4x+3 has roots alpha beta and gamma.
(a) Use the subistution x= the square root of u to obtain a cubic equation in u.
This supposedly equals u^3+8u^2+16u+9=0

If you can solve this n show how you will be an absolute star even my teacher couldnt
2. (Original post by emilyp2206)
RIGHT, the equation, x^3+4x+3 has roots alpha beta and gamma.
(a) Use the subistution x= the square root of u to obtain a cubic equation in u.
This supposedly equals u^3+8u^2+16u+9=0

If you can solve this n show how you will be an absolute star even my teacher couldnt
Are you sure that it isn't -9? I arrived at

Anyway

Try squaring both sides.

Not to mention that the question isn't typed correctly either. Closed.

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 28, 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