Calculate the indicated Riemann sum S3 for the function f(x)=x2?4x?12. Partition ?[0,3?] into three subintervals of equal?length, and let c1=0.5?, c2=1.6?, and c3=2.3.

Calculate the indicated Riemann sum S for the function f(x) = x"- 4x - 12. Partition [0,3] into three subintervals of equal length, and let c, = 0.5, C2 = 1.6, and C3 = 2.3. S3= (Simplify your answer.)