Jethro Lee's answer to .'s Secondary 4 E Maths Singapore question.
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answer should be 15
Date Posted:
3 years ago
this question posted under E Maths. although there is no rule that says cannot use A Maths technique to solve E Maths problems, have to consider that this student may not have learnt differentiation for part (b)(ii).
may be better to advise to solve using completing the square to get ...
y = 42250 - 10(x-15)^2,
which has maximum value at x =15.
may be better to advise to solve using completing the square to get ...
y = 42250 - 10(x-15)^2,
which has maximum value at x =15.
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