use two rectangles on [1,5] means they both have width 2.
So, the 2 subintervals are [1,3] and [3,5]
The midpoints are thus at x=2,4
So, take f(2) and f(4) for the heights.
Your approximation is just the sum of those two rectangles.
Use two rectangles of equal width to estimate the area between the graph of f(x) = x - cos(πx) and the x-axis on the interval [1, 5]. Evaluate the function at the mid-point of each rectangle to find each height.
a) 8
b) 12
c) 16
d) 20
thank you in advance.
3 answers
Thanks but can you explain me more because I am so so so confuse
what? You cannot evaluate f(x) at x=2 and x=4?
The height of the rectangles is
f(2) = 2 - cos(2π) = 2-1 = 1
f(4) = 4 - cos(4π) = 4-1 = 3
Since the width of each rectangle is 2, the area
a = 2*1 + 2*3 = 8
Now study your text's examples again, and it should make more sense.
If not, consider asking your teacher (or a tutor) for some one-on-one help.
youtube also has videos explaining quadrature.
The height of the rectangles is
f(2) = 2 - cos(2π) = 2-1 = 1
f(4) = 4 - cos(4π) = 4-1 = 3
Since the width of each rectangle is 2, the area
a = 2*1 + 2*3 = 8
Now study your text's examples again, and it should make more sense.
If not, consider asking your teacher (or a tutor) for some one-on-one help.
youtube also has videos explaining quadrature.