Question

Use left endpoints and 6 rectangles to find the approximation of the area of the region between the graph of the function 5x^2-x-1 and the x-axis over the interval [5,12] . Round your answer to the nearest integer.

Answer 1

you have to divide the interval \([5,12]\) in to six equal parts, which is rather a pain because this interval has length 7

Answer 2

how would i do that?

Answer 3

please explain...