Question

What should be added to a – b to get 2a + b?​ fast

Answer 1

Answer:

$a + 2b$

Step-by-step explanation:

$a + 2b + a - b$

$a + a + 2b - b$

$2a + b$

Answer 2

Answer:

let the number to be added = x

(a-b) + x = (2a+b)

x = 2a + b - a + b

= a + 2b