Calculus inequality question.. need help.. 10 pts :)?

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Kelci C

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Hey, I really need some help figuring these out. We're starting our integral unit and I have an exam coming up shortly. If you can show me the steps on solving this, it would help a lot. Thanks.

1. Suppose that f is concave upward and differentiable on (a,b). Let x < y in [a,b] and p be in (0,1), show that:

f(p*x + (1-p)*y) < p*f(x) + (1-p)*f(y)

What is the analogous inequality for a differentiable concave downward function?

Thanks :)
 
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