In this problem you will calculate ∫30x^2+2

by using the formal definition of the definite integral:

∫abf(x)=lim→∞[∑k=1 to n =f(xk)Δx].



(d) Express ∑=f(xk)Δx

in closed form. (Your answer will be in terms of

n.)



∑=1(∗)Δ

=



Please help I don't get what the closed form is or how to get it at all