This video tutorial explains how to approximate the area under the curve y = x^2 + 1 between x = 1 and x = 3 using four rectangles of equal width. The process involves determining the width (delta x) and height of each rectangle, using the left boundary for height calculation. The video calculates the approximate area and discusses the limitations of this method, noting it as an underestimate. Future videos will explore generalizations with arbitrary functions and different methods for defining rectangle heights.

What is the function used to approximate the area under the curve in this video?

• y = x^2 + 1

• y = x^3 + 1

• y = x^2 - 1

• y = x^3 - 1

How many rectangles are used to approximate the area under the curve?

• Five

• Two

• Three

• Four

What is the width of each rectangle, denoted as delta x?

• 2

• 1/2

• 1

• 1/4

How is the height of each rectangle determined in this approximation?

• Using the midpoint of the interval

• Using the average of the boundaries

• Using the left boundary of the interval

• Using the right boundary of the interval

Tags

CCSS.HSF.IF.A.2

What is the height of the first rectangle?

• f(2.5)

• f(2)

• f(1)

• f(1.5)

What is the approximate area under the curve calculated in the video?

• 10

• 9.25

• 8.75

• 7.5

Which of the following is true about the approximation method used?

• It overestimates the area

• It underestimates the area

• It uses trapezoids instead of rectangles

• It provides an exact area

What could improve the accuracy of the area approximation?

• Using circles instead of rectangles

• Using fewer rectangles

• Using more rectangles

• Using larger rectangles

What alternative methods are mentioned for defining the height of rectangles?

• Using the right boundary or midpoint

• Using the average of all boundaries

• Using the maximum value in the interval

• Using the minimum value in the interval

What other shapes are suggested for future exploration in approximating areas?

• Circles

• Triangles

• Trapezoids

• Hexagons