Evaluate the following definite integrals as limit of sums.`int_1^4 (x^2-x)dx`

Explanation

Here the function is .`(x^2-x)` is continuous in`[1,4]` since dividing the n length of`[1,4]` in the same length, the length of each subset is `h`


i.e., `h=(b-a)/n =(4-1)/n=3/n`


Here `a=1 b=4`


Now `f(a+ih)=f(1+ih)`


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