p(x)=x+9, then find p(x) +p(-x)
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if x+9=0
x=-9
so p[-x]=-[-9] ______ x=9
therefore , p[x] +p[-x]
-9 + 9= 0
x=-9
so p[-x]=-[-9] ______ x=9
therefore , p[x] +p[-x]
-9 + 9= 0
Joker91:
answer is 18 but i font know how
dont
sorry
its ok i think the answer is wrong
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