Question

Estimate the area under the graph of f(x) = 1 + x^2

Answer 1

from x = -1 to x = 2 using three rectangles and right end-points.

Answer 2

do we can find delta x by 2 - -1 which is 3. So \[Deltax = 3\]

Answer 3

wait... divide it by 3 so \[\Delta X = 1\] ?

Answer 4

um I am a little lost now... I am going to give this a quick try by using this \[\sum_{i = -1}^{3} 1 + x^2\]

Answer 5

wait that is wrong should be a 2 on top

Answer 6

R3 = 8 for the right hand side I am thinking

Answer 7

hmm you can't integrate normally ?

Answer 8

hmmm try to draw your area first