If $p (x) = x + 4$ then $p (x) + p (- x) = ?$
(a) 0
(b) 4
(c) 2x
(d) 8

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Solution

ANSWER: The correct option is (d) 8
Let: $p (x) = x + 4$
$∴ p (- x) = - x + 4$
Thus, we have: $p (x) + p (- x) = x + 4 + - x + 4$
$= 4 + 4$
$= 8$

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