b b a 2a..., Simplification, General Mathematics

Question:`b - [b - (a + b) - {b - (b - a - b)} + 2a]`

A `2b` 
B `a - b` 
C `a + b` 
D None of these

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+ AnswerD

+ ExplanationGiven Exp ,

`= b - [b - (a + b) - {b - {b - bara - b)} + 2a]`

`= b - [b -a  - b - {b - (b - a + b)} + 2a]`

`= b - [-a - {b - 2b + a + 2a}]`

`= b - [- a - {- b + 3a}]`

`= b - [ -a + b - 3a]`

`= b - [- 4a + b]`

`= b + 4a -b`

`= 4a`.

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