Same question as in Prob. 16 when f = 25x 2 + 4y 2 . Data from

Question:

Same question as in Prob. 16 when f = 25x2 + 4y2.

Data from Prob. 16

For what points P: (x, y, z) does ∇f with f = 25x2 + 9y2 + 16z2 have the direction from P to the origin?

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