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Homework Statement
For U(w)=sqrt(w), prove that U(pie(x)+(1-pie)y) > pie*U(x)+(1-pie)U(y)
Homework Equations
sqrt(x)=x^(1/2)
The Attempt at a Solution
I have:
sqrt(pie(x)+(1-pie)y) > pie*sqrt(x)+(1-pie)sqrt(y) so...
(pie(x)+(1-pie)y)^(1/2) > pie*(x)^1/2+(1-pie)(y)^1/2
From here I don't know where to go. I don't have much experience with proofs so can anyone give some guidance? Thanks for your help!
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