Eric Nicholas K's answer to Shan Kuek's Secondary 3 A Maths Singapore question.

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Eric Nicholas K
Eric Nicholas K's answer
5997 answers (Tutor Details)
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Something like this would be good.

We just need to find the coordinates of the turning point, the coordinates of the y-intercept and the signage of the coefficient of x2 to draw the graph. The graph will always be symmetrical about the vertical line passing through the turning point.

To be safe, we can find the x-intercepts also where possible (though not necessary all the time).