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## Homework Statement

Let f(x) = x^2 and let P = { -5/2, -2, -3/2, -1, -1/2, 0, 1/2 }

Then the problem asks me to compute Lf (P) and Uf (P).

Lf (P) =

Uf (P) =

## The Attempt at a Solution

Please explain how to solve. I thought that L[f] meant to calculate the lower bound with respect to f(x). and U[f] meant to calculate the upper bound with respect to f(x). Therefore, I plugged in 0 for f(0) = 10sin(0) = 0 for the lower bound. And

*π*/2 for the upper bound. Therefore, f(

*π/2) = 10sin(π/2) = 10. However, these were both wrong.*[/B]