Answer: <u> n = 3 </u> <u> n = 4 </u>
Upper Sum ≈ 3.41 Upper Sum ≈ 3.25
Lower Sum ≈ 2.15 Lower Sum ≈ 2.25
<u>Step-by-step explanation:</u>
You are trying to find the area under the curve. Area = height x width.
Height is the y-value at the given coordinate --> f(x)
Width is the distance between the x-values --> dx
<u>n = 3</u>
First, let's figure out dx: the distance from -1 to +1 is 2 units. We need to divide that into 3 sections because n = 3 --> dx = 2/3
So the points we will evaluate is when x = {-1, -1/3, 1/3, 1}
For the upper sum, we find the max y-value for each interval
For the lower sum, we find the min y-value for each interval
Next, let's find the height for each of the x-values:
f(x) = 1 + x²
f(-1) = 1 + (-1)² = 2
f(-1/3) = 1 + (-1/3)² = 1 + 1/9 --> 10/9
f(1/3) = 1 + (1/3)² = 1 + 1/9 --> 10/9
f(1) = 1 + (1)² = 2
<u>Interval </u> <u>Max </u> <u>Min</u>
{-1, -1/3} f(-1) = 2 f(-1/3) = 10/9
{-1/3, 1/3} f(-1/3) = 10/9 f(0) = 1 <em>(vertex lies in this interval)</em>
{1/3, 1} f(1) = 2 f(1/3) = 10/9
Now, let's find the Area: A = f(x) dx:
![\text{Upper Sum:}\quad A=\dfrac{2}{3}\bigg(2+\dfrac{10}{9}+2\bigg)\\\\.\qquad \qquad \qquad =\dfrac{2}{3}\bigg(\dfrac{46}{9}\bigg)\\\\.\qquad \qquad \qquad =\dfrac{92}{27}\\\\.\qquad \qquad \qquad =\large\boxed{3.41}](https://tex.z-dn.net/?f=%5Ctext%7BUpper%20Sum%3A%7D%5Cquad%20A%3D%5Cdfrac%7B2%7D%7B3%7D%5Cbigg%282%2B%5Cdfrac%7B10%7D%7B9%7D%2B2%5Cbigg%29%5C%5C%5C%5C.%5Cqquad%20%5Cqquad%20%5Cqquad%20%3D%5Cdfrac%7B2%7D%7B3%7D%5Cbigg%28%5Cdfrac%7B46%7D%7B9%7D%5Cbigg%29%5C%5C%5C%5C.%5Cqquad%20%5Cqquad%20%5Cqquad%20%3D%5Cdfrac%7B92%7D%7B27%7D%5C%5C%5C%5C.%5Cqquad%20%5Cqquad%20%5Cqquad%20%3D%5Clarge%5Cboxed%7B3.41%7D)
![\text{Lower Sum:}\qquad A=\dfrac{2}{3}\bigg(\dfrac{10}{9}+1+\dfrac{10}{9}\bigg)\\\\\\.\qquad \qquad \qquad \qquad =\dfrac{2}{3}\bigg(\dfrac{29}{9}\bigg)\\\\\\.\qquad \qquad \qquad \qquad =\dfrac{58}{27}\\\\\\.\qquad \qquad \qquad \qquad =\large\boxed{2.15}](https://tex.z-dn.net/?f=%5Ctext%7BLower%20Sum%3A%7D%5Cqquad%20A%3D%5Cdfrac%7B2%7D%7B3%7D%5Cbigg%28%5Cdfrac%7B10%7D%7B9%7D%2B1%2B%5Cdfrac%7B10%7D%7B9%7D%5Cbigg%29%5C%5C%5C%5C%5C%5C.%5Cqquad%20%5Cqquad%20%5Cqquad%20%5Cqquad%20%3D%5Cdfrac%7B2%7D%7B3%7D%5Cbigg%28%5Cdfrac%7B29%7D%7B9%7D%5Cbigg%29%5C%5C%5C%5C%5C%5C.%5Cqquad%20%5Cqquad%20%5Cqquad%20%5Cqquad%20%3D%5Cdfrac%7B58%7D%7B27%7D%5C%5C%5C%5C%5C%5C.%5Cqquad%20%5Cqquad%20%5Cqquad%20%5Cqquad%20%3D%5Clarge%5Cboxed%7B2.15%7D)
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<u>n = 4</u>
First, let's figure out dx: the distance from -1 to +1 is 2 units. We need to divide that into 4 sections because n = 4 --> dx = 2/4 = 1/2 <em>(simplified)</em>
So the points we will evaluate is when x = {-1, -1/2, 0, 1/2, 1}
For the upper sum, we find the max y-value for each interval
For the lower sum, we find the min y-value for each interval
Next, let's find the height for each of the x-values:
f(x) = 1 + x²
f(-1) = 1 + (-1)² = 2
f(-1/2) = 1 + (-1/2)² = 1 + 1/4 --> 5/4
f(0) = 1 + (0)² = 1
f(1/2) = 1 + (1/2)² = 1 + 1/4 --> 5/4
f(1) = 1 + (1)² = 2
<u />
<u>Interval </u> <u>Max </u> <u>Min</u>
{-1, -1/2} f(-1) = 2 f(-1/2) = 5/4
{-1/2, 0} f(-1/2) = 5/4 f(0) = 1
{0, 1/2} f(1/2) = 5/4 f(0) = 1
{1/2, 1} f(1) = 2 f(1/3) = 5/4
Now, let's find the Area: A = f(x) dx:
![\text{Upper Sum:}\qquad A=\dfrac{1}{2}\bigg(2+\dfrac{5}{4}+\dfrac{5}{4}+2\bigg)\\\\\\.\qquad \qquad \qquad \qquad =\dfrac{1}{2}\bigg(\dfrac{26}{4}\bigg)\\\\\\.\qquad \qquad \qquad \qquad =\dfrac{13}{4}\\\\\\.\qquad \qquad \qquad \qquad =\large\boxed{3.25}](https://tex.z-dn.net/?f=%5Ctext%7BUpper%20Sum%3A%7D%5Cqquad%20A%3D%5Cdfrac%7B1%7D%7B2%7D%5Cbigg%282%2B%5Cdfrac%7B5%7D%7B4%7D%2B%5Cdfrac%7B5%7D%7B4%7D%2B2%5Cbigg%29%5C%5C%5C%5C%5C%5C.%5Cqquad%20%5Cqquad%20%5Cqquad%20%5Cqquad%20%3D%5Cdfrac%7B1%7D%7B2%7D%5Cbigg%28%5Cdfrac%7B26%7D%7B4%7D%5Cbigg%29%5C%5C%5C%5C%5C%5C.%5Cqquad%20%5Cqquad%20%5Cqquad%20%5Cqquad%20%3D%5Cdfrac%7B13%7D%7B4%7D%5C%5C%5C%5C%5C%5C.%5Cqquad%20%5Cqquad%20%5Cqquad%20%5Cqquad%20%3D%5Clarge%5Cboxed%7B3.25%7D)
![\text{Lower Sum:}\qquad A=\dfrac{1}{2}\bigg(\dfrac{5}{4}+1+1+\dfrac{5}{4}\bigg)\\\\\\.\qquad \qquad \qquad \qquad =\dfrac{1}{2}\bigg(\dfrac{18}{4}\bigg)\\\\\\.\qquad \qquad \qquad \qquad =\dfrac{9}{4}\\\\\\.\qquad \qquad \qquad \qquad =\large\boxed{2.25}](https://tex.z-dn.net/?f=%5Ctext%7BLower%20Sum%3A%7D%5Cqquad%20A%3D%5Cdfrac%7B1%7D%7B2%7D%5Cbigg%28%5Cdfrac%7B5%7D%7B4%7D%2B1%2B1%2B%5Cdfrac%7B5%7D%7B4%7D%5Cbigg%29%5C%5C%5C%5C%5C%5C.%5Cqquad%20%5Cqquad%20%5Cqquad%20%5Cqquad%20%3D%5Cdfrac%7B1%7D%7B2%7D%5Cbigg%28%5Cdfrac%7B18%7D%7B4%7D%5Cbigg%29%5C%5C%5C%5C%5C%5C.%5Cqquad%20%5Cqquad%20%5Cqquad%20%5Cqquad%20%3D%5Cdfrac%7B9%7D%7B4%7D%5C%5C%5C%5C%5C%5C.%5Cqquad%20%5Cqquad%20%5Cqquad%20%5Cqquad%20%3D%5Clarge%5Cboxed%7B2.25%7D)