How do I determine what equations convergent series gives what turning point ?

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seals2001
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Hi ,
Am I meant to know intuitively from these 2 equations which one's convergent series will give me the left turning point's x coordinate and which will give me the right turning point's x coordinate, just from looking at the equations ?

Name:  Screenshot 2020-12-04 at 23.39.48.png
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Or are calculations required to determine*this ,*i.e i can't*determine*this just*from observing the equations and graphs *?


Thanks as always.
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DFranklin
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I don't understand why you're talking about turning points at all - can you explain?
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seals2001
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(Original post by DFranklin)
I don't understand why you're talking about turning points at all - can you explain?
Sorry I meant for this graph : Name:  Screenshot 2020-12-05 at 00.13.00.png
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DFranklin
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(Original post by seals2001)
Sorry I meant for this graph :
If you consider carefully what the question is asking, I don't think there is any requirement to determine which / whether either corresponds to a particular turning point: you merely have to show that solutions to those equations will also be solutions to c'(x) = 0.
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