1) Find the value βcβ that shows the mean value theorem for derivatives holds for f(xπ₯) =2x^π₯2 on the interval [β3,1]
2) Find the value βcβ that shows the mean value theorem for integrals holds for πf(x) =2x^2 on the interval [1,6]
1) Find the value βcβ that shows the mean value theorem for derivatives holds for f(x) =2x^2 on the interval [β3,1]
The slope of the line drawn between f(-3) and f(1) = [ 2 - 18] / [ 1 - (-3) ] = -16/ 4 = -4
And the derivative of 2x^2 = 4x
So.....we're looking for the x value where the tangent line to the curve at that point has the slope of -4
4x = -4 divide through by 4
x = -1
And -3 < -1 < 1 so the Theorem holds
2) Find the value βcβ that shows the mean value theorem for integrals holds for πf(x) =2x^2 on the interval [1,6]
We are trying to find "c" such that
6
β« 2x^2 dx = (2)c^2 * (6 -1)
1
(2/3)[6^3 - 1^3] = 10c^2
(2/3) (215) = 10c^2
215/15 = c^2
43/3 = c^2 take the positive root
β[43/3] = c β 3.7859
And this number is in the interval [1,6]