Question

Which expression is equivalent to 2 (a + 2 b) - a - 2b?

Answer 1

2 b + a

Explanation:

Simplify the following:

2 (a + 2 b) - a - 2 b

2 (a + 2 b) = 2 a + 4 b:

2 a + 4 b - a - 2 b

Grouping like terms, 2 a + 4 b - a - 2 b = (4 b - 2 b) + (2 a - a):

(4 b - 2 b) + (2 a - a)

4 b - 2 b = 2 b:

2 b + (2 a - a)

2 a - a = a:

Answer: 2 b + a