Jk's answer to li ann's Secondary 3 A Maths Singapore question.
The turning point, in itself, might not be sufficient to make the conclusion.
We somehow must be able to draw the conclusion that (5, 12) is a minimum point while (-3, -4) is a maximum point. We can rely on a graph to do this, or we just simply use regular brute force calculations to check for the nature of the turning point.
Added an alternative approach to the main question chat box.
This question looks more of a JC1 H2 Maths question than a Sec 3 A Maths question.
We somehow must be able to draw the conclusion that (5, 12) is a minimum point while (-3, -4) is a maximum point. We can rely on a graph to do this, or we just simply use regular brute force calculations to check for the nature of the turning point.
Added an alternative approach to the main question chat box.
This question looks more of a JC1 H2 Maths question than a Sec 3 A Maths question.
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