Earlier, Jamal found the Riemann Sum $\displaystyle\sum _ { i = 0 } ^ { 9 } \frac { 1 } { 2 } f ( - 3 + \frac { 1 } { 2 } i )$, to estimate the area under $f(x) = 3x^2 − 2$ in the interval $[−3, 2]$ using $10$ rectangles.

1. Use the summation feature of your calculator to find the approximate area using Jamal's Riemann sum.

   Answer (a):

   $29.375$ un$^2$

2. Find the exact area using an integral expression.

   Hint (b):

   First set up an integral on the given interval.