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swin2013
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b) if MVT applies, find each value of c in the invterval (a,b) that satisfies the equation
f(x)ln(x1) [2,4]

swin2013
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MVT does apply

swin2013
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dw:1354508966296:dw

hieuvo
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dw:1354508969756:dw

swin2013
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well i don't exactly understand finding f'c. i know that it's f'c = f(b)  f(a) / ba
so it's f(4)  f(2)  42?

swin2013
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i see that you took the derivative of the f(x) function

hieuvo
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yep, that's the derivative, which is function for the slope. it should at least one c so that the slope be equal to the line go through 2 endpoints

swin2013
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ohh yea, secant = tangent?

hieuvo
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what do you mean by that?

swin2013
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to prove that at c = 2/ln3 +1, the instantaneous is equal to the avg rate

swin2013
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well you set the secant slope answer to the derivative to find c

hieuvo
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you're right

swin2013
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Ooooohhh ok thanks!!!