Im having a hard time calculating Ln and Un of the function $\displaystyle y=3(x+2)^2+1$ bounded by $\displaystyle x=0$ and $\displaystyle x=6$. I know that $\displaystyle Delta Xi$ should be $\displaystyle 6/n$ and therefore $\displaystyle xi-1$ is $\displaystyle (i-1)(6/n)$, but no matter what i do to work the problem out, i cant seem to find the final formula for Ln or Un.

Please help me, someone.

Thank You