Question

How do you combine `(5a + 7b + 9c) - (5a + b + 2c)`?

Answer 1

`=color(blue)(6b+7c`

Explanation:

`5a+7b+9c−5a - b - 2c`

Grouping like terms

`(5a - 5a) +(7b - b) + (9c - 2c)`

`=color(blue)(6b+7c`