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use mean value theorem:
f(x)= 7- 2^x, [0,4], c=?
12 years ago

Answers

Steve
f(4) = -9
f(0) = 6
so, we want f'(c) = -15/4

f'(x) = -ln2 2^x
-15/4 = -ln2 2^c
15/(4ln2) = 2^c
ln(15/ln16) = c ln2
c = ln(15/(4ln2))/ln2 = 2.4356

which is in the interval [0,4]
12 years ago

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