Question

Justify a Solution The expression -3m - [2m + (5 - m)] + 7 was simplified as 2 - 4m. Without simplifying, explain how you can show that it has been simplified correctly.

Answer 1

Explanation:

Given the expression

`-3m - [2m + (5 - m)] + 7`

Step one

Firstly we have to open the inner bracket we have

`-3m - [2m + 5 - m] + 7`

Step two

we proceed further by opening up the next bracket we have

`-3m - 2m -5 +m+ 7`

Step three

we then have to collect like terms of m and rearrange.

`=-3m - 2m+m -5+ 7\\=-4m+2\\=2-4m`