Question

Combine like terms to simplify the expression 4m + 2n - m -n

Answer 1

4m+2n-m-n

Since 4m and -m are like terms, add -m to 4m to get 3m.
3m+2n-n

Since 2n and -n are like terms, add -n to 2n to get n.
3m+n

Answer 2

\[4m + 2n - m -n\]\[=(4-1)m + (2-1)n\]