GATE XE (Engineering Sciences) 2012 - Question 15

Section: Engineering Mathematics | Marks: 1

For 4 2 5 f x xy = − , the direction of maximum increase of ( , ) f x y at the point (2, 2) is along

• A. ˆ ˆ 3 10 i j +
• B. ˆ ˆ 12 40 i j − −
• C. ˆ ˆ 3 10 i j −
• D. ˆ ˆ 12 40 i j − +

Answer: C. ˆ ˆ 3 10 i j −