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Unformatted text preview: so we have solved the problem with and without using summation notation. Who says you cant have it both ways? 4.15 Let u be the unit vector u = 1 5 h4 3 i and x = h 5 7 i . Compute x k and x , where the direction is given by u . SOLUTION We use the formula x k = ( x u ) u to compute x k . Since x u =20 + 21 5 = 1 5 , this gives x k = 1 25 4 3 . Now, since x = x k + x , we have x = xx k , which gives x = 5 7 1 25 4 3 = 1 25 25 35 4 3 = 1 25 29 32 . 21 /september/ 2005; 22:09 35...
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This note was uploaded on 10/03/2010 for the course MATH 380 taught by Professor Gladue during the Fall '08 term at Roger Williams.
 Fall '08
 Gladue
 Calculus

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