If $x = 4$ , evaluate:
(i) $3 x + 8$ .

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Solution

Given :
$3 x + 8$

substituting $x = 4$ in the given expression

$3 x + 8 = 3 \times 4 + 8$
$= 12 + 8$
$= 20$
Hence, the value of $3 x + 8$ for $x = 4$ is $20$ .

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