If $p(x)=x+3$, then $p(x)+p(-x)$ is equal to
(a) 3
(b) $2 x$
(c) 0
(d) 6
(d) Given $p(x)=x+3$, put $x=-x$ in the given equation, we get $p(-x)=-x+3$
Now, $p(x)+p(-x)=x+3+(-x)+3=6$
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