Suppose that over a certain region of space the electrical potential V is given by the following equation. v(x, y, z) = 5x² - 5xy + xyz (a) Find the rate of change of the potential at P(6, 4, 7) in the direction of the vector v=i+j-k. (b) In which direction does V change most rapidly at P? (c) What is the maximum rate of change at P?

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