If f(x, y) = 2x² + 5y? and u is the unit vector in the direction of *, which of the following expressions equals Duf(x,y)? 2 V3 t. 2 Ch) - (2a? – (2x² + 5y²) 2 x + +5| у + 2 lim h→0 h 2 2 1 2| x 2 V3 +5( y 2 – (2æ² + 5y²) - | - lim h→0 h 2 3, 2 x + 2 1 + 5( y+ -h 2 – (2x² + 5y²) lim h→0 h 2 2, 2 x + 2 +5(y+ – (2x² + 5y²) - 2 lim h→0 h

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A: Let us solve above problem.

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Q: 11. Given vector u = (2, a, 3), vector v = (1, -3, b) and u x v = (13, -5, -7). Find a and b.

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A: The solution is given as

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Q: (d) Let w =(-39,22), v’i=(2–5), v°2=(5,-4), v°3=(-4,-1). If possible, express w as a linear…

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