Ask Singapore Homework?

Upload a photo of a Singapore homework and someone will email you the solution for free.



Question

secondary 4 | A Maths
One Answer Below

Anyone can contribute an answer, even non-tutors.

Answer This Question
CIA
CIA

secondary 4 chevron_right A Maths chevron_right Singapore

How to explain b?

Date Posted: 1 month ago
Views: 51
Boy Mow Chau
Boy Mow Chau
1 month 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.

See 1 Answer

done {{ upvoteCount }} Upvotes
clear {{ downvoteCount * -1 }} Downvotes
sstrike
Sstrike's answer
5445 answers (A Helpful Person)