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![\left[\left(\dfrac{2}{3}\right)^2\cdot\left(\dfrac{2}{3}\right)^{-1}\right]^3=\left[\left(\dfrac{2}{3}\right)^{2+(-1)}\right]^3\\\\=\left[\left(\dfrac{2}{3}\right)^1\right]^3=\left(\dfrac{2}{3}\right)^3=\dfrac{2^3}{3^3}=\dfrac{8}{27}\\\\Used:\\\\a^n\cdot a^m=a^{n+m}\\\\\left(\dfrac{a}{b}\right)^n=\dfrac{a^n}{b^n}](/tpl/images/0077/0984/82629.png)
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Write the summation to estimate the area under the curve y = 1 + x2 from x = -1 to x = 2 using 3 rectangles and right endpoints
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