find the gradient of f(x,y)=7*x^5*y^2-9*x^8*y^6

Evaluate the gradient of f at the point P, where

f(x,y,z)=x^4*y^3*z, P(-1,3,-1)

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- Apr 28th 2008, 03:39 AMsamdmansamEvaluating gradient
find the gradient of f(x,y)=7*x^5*y^2-9*x^8*y^6

Evaluate the gradient of f at the point P, where

f(x,y,z)=x^4*y^3*z, P(-1,3,-1) - Apr 28th 2008, 04:15 AMJameson
Ok. So the gradient is just a vector field of the partial derivatives. For #1) grad F = (df/dx , df/dy). And those are partial derivatives of course.

#2) grad F = (df/dx, df/dy, df/dx) and once you get your vector field plug in the particular case of point (-1,3,1) that they want.