Andrea Yeo's answer to Twinkelbekl's Secondary 4 A Maths Singapore question.

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Andrea Yeo
Andrea Yeo's answer
3 answers (Tutor Details)
1st
1. Find y in terms of x. Area of PQRS = 2x * y.

2. Find max x value by differentiation of A over x. Sub value of x into area formula to get max. area.