Posted by: comingsoon October 21, 2010
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khoikkhoik and V2001 , I had required equation of parabola(in x2 form) then I can do in my way ...
f(N)=-10N2+760N
after getting this equation I solve like this
vertex(N)= -b/2a
= -760/-2*10
= 38 ans
(By the way, derivative is also another way but I have to solve by this method......)
also V2001's idea is also great... anyway thanks for discussion ....... Happy Dipawali .
khoikkhoik and V2001 , I had required equation of parabola(in x2 form) then I can do in my way ...
f(N)=-10N2+760N
after getting this equation I solve like this
vertex(N)= -b/2a
= -760/-2*10
= 38 ans
(By the way, derivative is also another way but I have to solve by this method......)
also V2001's idea is also great... anyway thanks for discussion ....... Happy Dipawali .