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viva [34]
3 years ago
8

Example 5 suppose that f(0) = −8 and f '(x) ≤ 9 for all values of x. how large can f(3) possibly be? solution we are given that

f is differentiable (and therefore continuous) everywhere. in particular, we can apply the mean value theorem on the interval [0, 3] . there exists a number c such that f(3) − f(0) = f '(c) − 0 so f(3) = f(0) + f '(c) = −8 + f '(c). we are given that f '(x) ≤ 9 for all x, so in particular we know that f '(c) ≤ . multiplying both sides of this inequality by 3, we have 3f '(c) ≤ , so f(3) = −8 + f '(c) ≤ −8 + = . the largest possible value for f(3) is .
Mathematics
1 answer:
joja [24]3 years ago
6 0

f'(x) exists and is bounded for all x. We're told that f(0)=-8. Consider the interval [0, 3]. The mean value theorem says that there is some c\in(0,3) such that

f'(c)=\dfrac{f(3)-f(0)}{3-0}

Since f'(x)\le9, we have

\dfrac{f(3)+8}3\le9\implies f(3)\le19

so 19 is the largest possible value.

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