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Special points of the graph in circles?

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Hey, I was going through some recent mark schemes and wondered why they often allocate a whole mark for circling certain points when we have to draw a graph. I'm not sure how this works. What features are you supposed to circle? Maxima? Minima? X/Y intercepts?

 

Thanks in advance!

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Hey, I was going through some recent mark schemes and wondered why they often allocate a whole mark for circling certain points when we have to draw a graph. I'm not sure how this works. What features are you supposed to circle? Maxima? Minima? X/Y intercepts?

 

Thanks in advance!

I would just circle the points you know the coordinates of, such as the ones you mentioned. However, I have also noticed that they reward points for filling in the ends of the function, which is to illustrate that you know that what you have plotted only depicts the given domain, and that the function will in fact continue.

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