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

is the answer correct ?

Date Posted: 5 months ago
Views: 68
Eric Nicholas K
Eric Nicholas K
5 months ago
Where is your f'(x)?

Since I see only equal signs all the way, it means that all the working lines equal to f(x).

Presentation needs to be clearer, so f'(x) must be written on the second last line of your working (the one starting with 3).

Other than that, your second working line is not correct.

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Eric Nicholas K
Eric Nicholas K's answer
2265 answers (Tutor Details)
Your techniques of differentiation are ok. But the re-expressing of the terms in the first two blue working lines is incorrect.
Eric Nicholas K
Eric Nicholas K
5 months ago
In other words, the '3' remains in the denominator.