Riemann Sum with Signed Area

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Calculus: Calculate the Riemann sum for the function f(x) = (x-1)^2-1 over the interval [1,3] with 10 rectangles and using right endpoint. The graph is below the x-axis on [1,2]. We also compute the Riemann sum for n rectangles and let n go to infinity.
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@ICUPP93 Thanks! When doing these sums, we have to invoke special rules for sums of powers of integers. I review this in Overview of Summation Formulas. I'll annotate here for clarity. - Bob

MathDoctorBob
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@ReallHardCoreGamer You're welcome, and good luck! - Bob

MathDoctorBob
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@messtomasses You're welcome! - Bob

MathDoctorBob
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video's great, but i dont understand how you got (n(n+1)(2n+1))/6 on the last page. please help

ICUPP