Question

2(3m+6n) + 3(5m-2n)+ 5(-6m+n) ​

Answer 1

`2(3m + 6n) + 3(5m - 2n) + 5( - 6m + n) \\`

open the brackets:

`= (6m + 12n) + (15m - 6n) + ( - 30m + 5n) \\`

group the coefficients of m and n in their brackets:

`= (6 + 15 - 30)m + (12 - 6 + 5)n \\`

then operate the brackets:

`= - 9m + 11n`