I don't remember what is a extraneous solution, but i hope it helps
Write the summation to estimate the area under the curve y = 1 + x^2 from x = –1 to x = 2 using 3 rectangles and right endpoints
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the summation from i equals negative 1 to 2 of the quantity i squared plus 1
the summation from i equals 0 to 2 of the quantity i squared plus 1
the summation from i equals 1 to 3 of the quantity i squared plus 1
None of these
the summation from i equals negative 1 to 2 of the quantity i squared plus 1
the summation from i equals 0 to 2 of the quantity i squared plus 1
the summation from i equals 1 to 3 of the quantity i squared plus 1
None of these
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