Let f be the function defined by f(x)=x^2 + x and divide the interval [-1,2] into six subintervals of equal length. For each of the following tags, write out the corresponding tagged partition tP of [-1,2] and find S(f, tP).:

-1, 1/3, 2/3, 1/ 4/3, 5/3, 2

The left endpoint of each subinterval is the tag:

[(-1)^2 +(-1)](-1) + [(1/3)^2 +(1/3)](-1) + [(2/3)^2 +(2/3)](-1)+...+ [(2)^2 +(2)](-1)= ...

Did i do this right?