AP Calculus BC : Numerical Approximations to Definite Integrals
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Example Question #41 : Introduction To Integrals
Find the Left Riemann sum of the function
on the interval divided into four sub-intervals.
The interval divided into four sub-intervals gives rectangles with vertices of the bases at
For the Left Riemann sum, we need to find the rectangle heights which values come from the left-most function value of each sub-interval, or f(0), f(2), f(4), and f(6).
Because each sub-interval has a width of 2, the Left Riemann sum is
Given a function , find the Left Riemann Sum of the function on the interval divided into three sub-intervals.
In order to find the Riemann Sum of a given function, we need to approximate the area under the line or curve resulting from the function using rectangles spaced along equal sub-intervals of a given interval. Since we have an interval divided into sub-intervals, we'll be using rectangles with vertices at .
To approximate the area under the curve, we need to find the areas of each rectangle in the sub-intervals. We already know the width or base of each rectangle is because the rectangles are spaced units apart. Since we're looking for the Left Riemann Sum, we want to find the heights of each rectangle by taking the values of each leftmost function value on each sub-interval, as follows:
Putting it all together, the Left Riemann Sum is
Example Question #3 : Integrals
Given a function , find the Left Riemann Sum of the function on the interval divided into four sub-intervals.
To approximate the area under the curve, we need to find the areas of each rectangle in the sub-intervals. We already know the width or base of each rectangle is because the rectangles are spaced unit apart. Since we're looking for the Left Riemann Sum, we want to find the heights of each rectangle by taking the values of each leftmost function value on each sub-interval, as follows:
Example Question #1 : Riemann Sum: Left Evaluation
Example Question #10 : Integrals
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