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 3 years ago
use the second derivative test to find local extrema and saddle point of f(x,y)=6x^22x^3+3y^2+6xy
 3 years ago
use the second derivative test to find local extrema and saddle point of f(x,y)=6x^22x^3+3y^2+6xy

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elica85
 3 years ago
Best ResponseYou've already chosen the best response.2df/dx=12x6x^2+6y df/dy=6y+6x next step is to find critical points

elica85
 3 years ago
Best ResponseYou've already chosen the best response.2set df/dy=0 and y=x i'm stuck on df/dx=0...

imranmeah91
 3 years ago
Best ResponseYou've already chosen the best response.0don't you need second derivative?

elica85
 3 years ago
Best ResponseYou've already chosen the best response.2o wait, nevermind i use y=x in setting df/dx=0 i think i can get it now (slapping forehead)
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