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gizmo_the_mogwai [7]
3 years ago
6

If f(1) = 10 and f '(x) ≥ 3 for 1 ≤ x ≤ 6, how small can f(6) possibly be?

Mathematics
2 answers:
Hoochie [10]3 years ago
7 0

Answer:

25

Step-by-step explanation:

Our "best" case is when f'(x) = 3 everywhere - if it changes it means f(x) will grow faster. But if f'(x) is constant, it means f(x) is the straight line [tex] y-10 = 3 (x-1) [tex], which passes through the point (6, 25)

Natalka [10]3 years ago
6 0

Answer:

f'( x ) =  \frac{f(b) - f(a)}{b - a}  \\  = \frac{f(6) -f(a)}{6 - 1} \\  3\leqslant \frac{f(6) - 10}{5} \\  15\leqslant f(6) - 10 \\ f(6) \geqslant 15 + 10 \\ f(6) \geqslant 25

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