determine whether the function is a Cost Function?

qwertyunal

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Nov 13, 2014
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P1=Price of Input 1
P2=Price of Input 2
Q= Total Production Level

f(P1,P2, Q) = (P1 + P2) * (Q^0.5)

So we know that Cost function is Concave, Non-decreasing, Continuous and Homogeneous in Input Prices(P1,P2)
Is the above function Concave in Input Prices?
Can it be a cost function?:confused:
 
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