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18.06 Linear Algebra, Final Exam Solution - MIT …

(d) If the vector b is the sum of the four columns of A, write down the complete Solution to Ax = b. Answer: . 1 2 3. 1 . + x2 1 + x4 2 .. x= . 1 0 0 . 1 0 1. 2. (11 points) This problem nds the curve y = C + D 2 t which gives the best least squares t to the points (t, y) = (0, 6), (1, 4), (2, 0). (a) Write down the 3 equations that would be satis ed if the curve went through all 3 points. Answer: C + 1D = 6. C + 2D = 4. C + 4D = 0. (b) Find the coe cients C and D of the best curve y = C + D2 t . Answer: . 1 1 . T. 1 1 1 3 7. A A= 1 =. 2 . 1 2 4 7 21.. 1 4.. 6 . 1 1 1 10. AT b =.. =. 4 . 1 2 4 14.. 0. Solve AT Ax = AT b : . 3 7 C 10 C 1 21 7 10 8. = gives = = . 7 21 D 14 D 14 7 3 14 2. (c) What values should y have at times t = 0, 1, 2 so that the best curve is y = 0?

The projection is p = (0, 0, 0) if AT b = 0. In this case, b = values of y = c(2, −3, 1). 3. ... is orthogonal to the axis vector 1 ⎣ . 1 So are k − j and i − k. By symmetry the rotation takes i to j, j to k, k to i. (b) Find the matrix A that produces this rotation (so Av is the rotation of v). Explain why

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