5. The Second Derivative Test for Local Maxima and Minima (Section 4.4) says: a. f has a local maximum at x = c if f'(c) = 0 and f"(c) < 0. b. fhas a local minimum at x = c if f'(c) = 0 and f"(c) > 0. %3D

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Chapter2: Second-order Linear Odes
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B I
UA
3日回,川 ===|=
4
5.
Proving the Second Derivative Test
5. The Second Derivative Test for Local Maxima and Minima (Section 4.4) says:
a. fhas a local maximum at x = c if f'(c) =0 and f"(c) < 0.
b. f has a local minimum at x= c if f'(c) = 0 and f"(c) > 0.
To prove statement (a), let ɛ = (1/2) |f"(c)|. Then use the fact that
%3D
f"(c) = lim
f'(c+h)-f'(c)
h
f'(c+h)
= lim
%3D
To conclude that for some 8 > 0,
f'(c+h)
0 < /h| < 8
<f"(c) + e < 0.
Thus f'(c + h) is positive for – 8 <h < 0 and negative for 0 <h< d. Prove statement (b) in a similar
way.
11
Transcribed Image Text:ols Add-ons Help Last edit was 2 minutes ago Times New... B I UA 3日回,川 ===|= 4 5. Proving the Second Derivative Test 5. The Second Derivative Test for Local Maxima and Minima (Section 4.4) says: a. fhas a local maximum at x = c if f'(c) =0 and f"(c) < 0. b. f has a local minimum at x= c if f'(c) = 0 and f"(c) > 0. To prove statement (a), let ɛ = (1/2) |f"(c)|. Then use the fact that %3D f"(c) = lim f'(c+h)-f'(c) h f'(c+h) = lim %3D To conclude that for some 8 > 0, f'(c+h) 0 < /h| < 8 <f"(c) + e < 0. Thus f'(c + h) is positive for – 8 <h < 0 and negative for 0 <h< d. Prove statement (b) in a similar way. 11
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