Simplify these expressions and find their values if $x = 3, a = - 1, b = - 2$
$2 a - 2 b - 4 - 5 + a$

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Solution

Consider $2 a - 2 b - 4 - 5 + a$
Putting, $x = 3, a = - 1, b = - 2$ , we get
$2 a - 2 b - 4 - 5 + a = 2 (- 1) - 2 (- 2) - 4 - 5 + (- 1) = - 2 + 4 - 4 - 5 - 1 = - 8$
Hence, the value of $2 a - 2 b - 4 - 5 + a$ is $- 8$ .

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