Question

What must be subtracted from 2a + b to get 2a – b? (a) 2b (b) 4a (c) 0 (d) 4a + 4b

Answer 1

Answer:

Step-by-step explanation:

Let us assume the number that we have to find be X.

Mathematically, the problem that is given to us can be represented by-

⇒ 2a + b - X = 2a - b.

Let us bring 2a - b from the right-hand side to the left-hand side and its sign would change from 2ab to -(2a-b).

Similarly, -X can be shifted from the left-hand side to the right-hand side and it sign would change from -X to +X.

Then we would get,

⇒2a+b-(2a - b) = X

⇒2a+b2a + b = X

⇒ 2b = X.

Hence, 2b must be subtracted from 2a+b to get 2a-b.

Answer 2

$Let \: the \: number \: be \: x \\ \\ x - 2a + b = 2a - b \\ \\ x = 2a - b - 2a + b \\ \\ x = 2a - 2a - b + b \\ \\ x = 0$