Let f be the function defined by f(x)=x4. If five subintervals of equal length are used, what is the value of the midpoint Riemann sum approximation for ∫12x4dx ? Round to the nearest thousandth if necessary.Answer:
Q. Let f be the function defined by f(x)=x4. If five subintervals of equal length are used, what is the value of the midpoint Riemann sum approximation for ∫12x4dx ? Round to the nearest thousandth if necessary.Answer:
Calculate Width of Subintervals: To calculate the midpoint Riemann sum, we first need to determine the width of each subinterval. The interval [1,2] has a length of 2−1=1. Since we are using five subintervals, the width (Δx) of each subinterval is 51.
Find Midpoints of Subintervals: Next, we need to find the midpoints of each subinterval. The midpoints will be used to evaluate the function f(x)=x4. The midpoints are found by adding half of the width of a subinterval to the lower endpoint of each subinterval.
Evaluate Function at Midpoints: The midpoints mi for the five subintervals are as follows:m1=1+51/2=1.1m2=1.2+51/2=1.3m3=1.4+51/2=1.5m4=1.6+51/2=1.7m5=1.8+51/2=1.9
Perform Function Calculations: Now we evaluate the function f(x)=x4 at each midpoint: f(m1)=(1.1)4f(m2)=(1.3)4f(m3)=(1.5)4f(m4)=(1.7)4f(m5)=(1.9)4
Calculate Riemann Sum: Perform the calculations for each f(mi):f(m1)=(1.1)4=1.4641f(m2)=(1.3)4=2.8561f(m3)=(1.5)4=5.0625f(m4)=(1.7)4=8.3521f(m5)=(1.9)4=13.0321
Substitute Values into Formula: The midpoint Riemann sum approximation is the sum of the function values at the midpoints multiplied by the width of the subintervals (Δx): Riemann sum = Δx⋅(f(m1)+f(m2)+f(m3)+f(m4)+f(m5))
Calculate Riemann Sum: Substitute the values we have calculated into the Riemann sum formula:Riemann sum = (51)×(1.4641+2.8561+5.0625+8.3521+13.0321)
Round Riemann Sum: Calculate the Riemann sum:Riemann sum = (51)×(30.7669)Riemann sum = 6.15338
Round Riemann Sum: Calculate the Riemann sum:Riemann sum = (51)×(30.7669)Riemann sum = 6.15338Round the Riemann sum to the nearest thousandth:Riemann sum ≈6.153
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