$3 a - [4 a - ¯ ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯ ¯ 3 a - 5 b - 3 {2 a - (3 a - ¯ ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯ ¯ 2 a - 3 b)}]$ = $[3 M a r k s]$

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Solution

$3 a - [4 a - ¯ ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯ ¯ 3 a - 5 b - 3 {2 a - (3 a - ¯ ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯ ¯ 2 a - 3 b)}] = 3 a - [4 a - 3 a + 5 b - 3 {2 a - (3 a - 2 a + 3 b)}] [1 M a r k] = 3 a - [4 a - 3 a + 5 b - 3 {2 a - (a + 3 b)}] = 3 a - [4 a - 3 a + 5 b - 3 {2 a - a - 3 b}] = 3 a - [a + 5 b - 6 a - 3 a + 9 b] [1 M a r k] = 3 a - [- 8 a + 14 b] = 3 a + 8 a - 14 b = 11 a - 14 b$ $[1 M a r k]$

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(10)

$3 a - [4 a - ¯ ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯ ¯ 3 a - 5 b - 3$ { $2 a - (3 a - ¯ ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯ ¯ 2 a - 3 b)$ } $]$ equals

$3 a - [4 a - ¯ ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯ ¯ 3 a - 5 b - 3 {2 a - (3 a - ¯ ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯ ¯ 2 a - 3 b)}]$ equals

3 a - [4 a - ¯ ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯ ¯ 3 a - 5 b - 3 {2 a - (3 a - ¯ ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯ ¯ 2 a - 3 b)}]

Simplify :

$- 3 a - \{2 a + 5 b - (a - b)\} - 6 a - (3 a - \bar{4 a + b})$

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