Lim Han Quan's answer to Lionel Cheah's Secondary 4 A Maths question.

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Lim Han Quan
Lim Han Quan's answer
43 answers (A Helpful Person)
1st
1. Differentiate once to get the dy/dx and equate to 0, this should help you find the value of x at the stationary points

2. Differentiate again to get the d2y/dx2 and sub in the values of x found in step 1, this should help you find out if the d2y/dx2 of the curve is >0 or <0,

>0 is a minimum point
<0 is a maximum point

A little late but I hope this helps :)