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Derivative - Max and Min application!

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SGVaibhav:
Question asked in the picture below!

THanks a lot for help!!

Ghost Of Highbury:
I dont know how to find the closest point.

However, about the formula, Both ur suggested formulas are correct.

This is because its *squared*

lets say if x =10

first formula : (18-10)^2 = 64

second formula : (10-18)^2 = 64

hope that helped

Alpha:
I can't view the pic.  ???

SGVaibhav:
alpha, its weird that u cannot see the pic ???

astar, i am getting different answers everytime i solve this, :( :( :(
can u please solve it with some working.

i dont understand what to find out after getting the derivative :(

Alpha:
I really can't see... I've tried all that I could.  ??? :-[

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