Recall that a left Riemann sum for f {\displaystyle f} on [ a , b ] {\displaystyle [a,b]} with n {\displaystyle n} subintervals takes the form
where Δ x = b − a n . {\displaystyle \Delta x={\frac {b-a}{n}}.}
Compare the given sum to this formula.
![{\displaystyle [a,b]}](https://wiki.ubc.ca/api/rest_v1/media/math/render/svg/9c4b788fc5c637e26ee98b45f89a5c08c85f7935)
