If $p (x) = x + 3$ , then find the value of $p (x) + p (- x)$

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Solution

$p (x) = x + 3$

$p (- x) = - x + 3$

So, $p (x) + p (- x) = x + 3 + (- x) + 3$
$\Rightarrow p (x) + p (- x) = x + 3 - x + 3$

$= 3 + 3$

$= 6$

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