8. The second directional derivative of a function f(r, y) is DS(x, v) = D.[D.f(r, y)]. If f(r, y) = r* + 5x²y +y and u = (.), calculate Df(2, 1). 9. Show that the sum of the r-, y-, and z- intercepts of any tangent plane to the surface VI+ Vỹ+ VE = vc is a constant.

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8. The second directional derivative of a function f(r, y) is Df(r, y) = D. [Duf(x,y)].
If f(r, y) = x + 5a²y + y* and u = ( 1), calculate Df(2, 1).
%3D
9. Show that the sum of the r-, y-, and z- intercepts of any tangent plane to the surface
Vi+ V+ VE = Ve is a constant.
Transcribed Image Text:8. The second directional derivative of a function f(r, y) is Df(r, y) = D. [Duf(x,y)]. If f(r, y) = x + 5a²y + y* and u = ( 1), calculate Df(2, 1). %3D 9. Show that the sum of the r-, y-, and z- intercepts of any tangent plane to the surface Vi+ V+ VE = Ve is a constant.
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