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secondary 4 | A Maths
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secondary 4 chevron_right A Maths chevron_right Singapore

How to explain b?

Date Posted: 10 months ago
Views: 122
Boy Mow Chau
Boy Mow Chau
10 months ago
answer for (b).

disagree. for -2 < x < 3, f"(x) actually decreases from some positive value to some negative value.

explanation ...

f''(x) gives the gradient of y = f'(x).

at x = -2, y = f(x) has a minimum point, with
f'(x) = 0, and f'(x) is increasing, so f''(x) > 0.

at x = 3, y = f(x) has a maximum point, with
f'(x) = 0, and f'(x) is decreasing, so f''(x) < 0.

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sstrike
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