Simplify these expression and find their values if $x = 3, a = - 1, b = - 2$ .
$10 - 3 b - 4 - 5 b$ .

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Solution

$10 - 3 b - 4 - 5 b = - 3 b - 5 b + 10 - 4$
$= - 8 b + 6$
$= - 8 (- 2) + 6$ [Putting $b = - 2$ ]
$= 16 + 6 = 22$ .

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