Answer:
-5a
Explanation:
Think of it as 5-10 since both of them have "a"
5-10=-5
Algebra are algebraic expressions that can be used as variables and is subjected to BODMAS rule just like numerical expressions.
Example: 5b + 9b = 14b
Given from the question:
5a - 10a = -5a
7.9m questions
10.5m answers