If a=2 and b=5,the value of the expression
$2 a - [3 a + 4 b - (2 a - b) + 5 a - 7 b]$ is:

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Solution

The given expression is simplified as $2 (b - 2 a)$
$\Rightarrow 2 (5 - 4) = 2$

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Similar questions

Add $2 a + 3 b + c + d, - a + b - c - d$ and $3 a - 4 b - 2 c - 2 d$ . Find the value of the final expression if a=2, b=3, c=4, d=5. [3 MARKS]

2 (a - 3) + 4 b - 2 (a - b) + 5

∣ ∣ ∣ ∣ \begin{matrix} a + b & 2 a + b & 3 a + b 2 a + b & 3 a + b & 4 a + b 4 a + b & 5 a + b & 6 a + b \end{matrix} ∣ ∣ ∣ ∣

\vec{a} and \vec{b}

|\vec{a}| = 2, |\vec{b}| = 1 and \vec{a} \cdot \vec{b} = 1,

(3 \vec{a} - 5 \vec{b}) \cdot (2 \vec{a} + 7 \vec{b}) .

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