Given
n= 4equal-width rectangles
To determine the height of each rectangle.
Now,
The right end point of each sub-interval is 2.
Let f(x) be the height of the rectangle.
therefore, for the rectangle bases is 1 in each case.
That implies the value of x in each integrand is, 2,1,0,-1,-2.
Then,
For x=2,
For x=1,
For x=0,
For x=-1,
For x=-2,
Hence, the height of each rectangle is,