Find the average value of the function f(x)=2x−114 from x=6 to x=10. Write your answer as the logarithm of a single number in simplest form.Answer: ln(□)
Q. Find the average value of the function f(x)=2x−114 from x=6 to x=10. Write your answer as the logarithm of a single number in simplest form.Answer: ln(□)
Calculate Interval Length: To find the average value of the function f(x)=2x−114 over the interval [6,10], we need to integrate the function over this interval and then divide by the length of the interval.The average value formula is given by:Average value = (b−a)1×∫abf(x)dxHere, a=6 and b=10.
Set Up Integral: First, we calculate the length of the interval [6,10], which is b−a.Length of interval = 10−6=4
Perform Substitution: Next, we set up the integral of f(x) from 6 to 10.∫6102x−114dxWe will need to use a substitution to solve this integral.Let u=2x−11, then du=2dx.
Change Limits: We need to change the limits of integration to match our substitution.When x=6, u=2(6)−11=1.When x=10, u=2(10)−11=9.Now we can rewrite the integral in terms of u.∫19u4⋅21duThe 21 comes from the fact that du=2dx, so dx=21du.
Integrate u−1: Now we integrate u−1 with respect to u from 1 to 9.∫u−1du is the natural logarithm function, ln(u). So, 2×∫19u−1du=2×[ln(u)]19 = 2×(ln(9)−ln(1))
Simplify Expression: Since ln(1)=0, we simplify the expression.2×(ln(9)−ln(1))=2×ln(9)
Find Average Value: Now we divide by the length of the interval to find the average value.Average value = (41)×2×ln(9)= (21)×ln(9)
Simplify ln(9): We can simplify ln(9) since 9 is a perfect square.ln(9)=ln(32)=2×ln(3)So, the average value becomes:Average value = (1/2)×2×ln(3)= ln(3)
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