Let a be a real number and f(x, y) = 4ax²y + 5xy³. Let v = 3i – j and let Vf(x, y) denote the gradient of f(x, y). i) Find Vf(1,1) in terms of a.

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Author:R. David Gustafson, Jeff Hughes
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Chapter2: Functions And Graphs
Section2.6: Proportion And Variation
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Let a be a real number and f(x, y) = 4ax?y+ 5xy³.
Let v = 3i – j and let Vf(x, y) denote the gradient of f(x,y).
i) Find Vf(1, 1) in terms of a.
-12/5
i) If the rate of change of f(r, y) at the point (1, 1) in the direction of v is
find a.
(8a + 5) i + (4a + 15) j, ii) -3
(8a + 5) i + (4a + 15) j, ii) -9
(8а + 5) i + (4а + 15) ј, iї) 9
(8а + 5) і + (4а + 15) ј, i) 0
(4a + 5) i + (-8a + 15) j, ii) -3
(4a + 5) i + (-8a + 15) j, ii) -9
(4a + 5) i + (-8a + 15) j, ii) 9
(4a + 5) i + (-8a + 15) j, ii) 0
Transcribed Image Text:Let a be a real number and f(x, y) = 4ax?y+ 5xy³. Let v = 3i – j and let Vf(x, y) denote the gradient of f(x,y). i) Find Vf(1, 1) in terms of a. -12/5 i) If the rate of change of f(r, y) at the point (1, 1) in the direction of v is find a. (8a + 5) i + (4a + 15) j, ii) -3 (8a + 5) i + (4a + 15) j, ii) -9 (8а + 5) i + (4а + 15) ј, iї) 9 (8а + 5) і + (4а + 15) ј, i) 0 (4a + 5) i + (-8a + 15) j, ii) -3 (4a + 5) i + (-8a + 15) j, ii) -9 (4a + 5) i + (-8a + 15) j, ii) 9 (4a + 5) i + (-8a + 15) j, ii) 0
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