Use the contour diagram of to decide if the specified directional derivative is

Question

Use the contour diagram of to decide if the specified directional derivative is positive, negative, or approximately zero.

   ?   Positive   Negative   Zero      1. At the point in the direction of ,

   ?   Positive   Negative   Zero      2. At the point in the direction of ,

   ?   Positive   Negative   Zero      3. At the point in the direction of ,

   ?   Positive   Negative   Zero      4. At the point in the direction of ,

   ?   Positive   Negative   Zero      5. At the point in the direction of ,

   ?   Positive   Negative   Zero      6. At the point in the direction of ,

(Click graph to enlarge) f (i rightarrow - 2j rightarrow)/ 5 (0, 2) j rightarrow ( - 1, 1) ( - j rightarrow - j rightarrow)/ 2 ( - 1, 1) ( - j rightarrow + j rightarrow) 2 (1, 0) -j rightarrow (-2, 2) i rightarrow

Explanation / Answer

1.positivie

2.positive

3.zero

4.negative

5.zero

6.positive

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