# Simple algebra problem

1. Jun 6, 2012

### synkk

The blue bit, I understand how they got the 3, but shouldnt it be $$3n^2(2n+1)^2$$
?

exercise E 2c

Last edited: Jun 6, 2012
2. Jun 6, 2012

### Villyer

Assuming the middle statement to be correct, I would think that you are right here.

Edit: sacsale is right, it's correct as is.

Last edited: Jun 6, 2012
3. Jun 6, 2012

### sacscale

It was factored out, note the brackets.