How do you simplify 2m - [n - (m - 2n)]?

2 Answers
Apr 11, 2018

3m-3n

Explanation:

Expand the curly brackets first

2m-[n-m+2n]
2m-[3n-m]
Then expand the square brackets

2m-3n+m
3m-3n

Apr 11, 2018

3m - 3n

Explanation:

You start by getting rid of the brackets inside the other brackets

2m - ( n - m + 2n)

The + became a - because there was another - in front. Now you remove the other bracket

2m - n + m - 2n

3m - 3n

and if you like you can write this as a common factor

3 ( m - n )

The main thing is to understand that the signs alter as shown before.