Work Problem 1 (* Determine whether the vector v is in the span of a set S, where a) v = ( 2 –1 1 3) and S=(1 0 1 -1), (0 1 1 1)} in R4 b) v = - x³ +2x²– 3x-3 and S={x³+x² + x+1, x²+ x+1, x+1} in P3
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- In Problems 21–26, decompose v into two vectors v1 and v2 , where v1 is parallel to w, and v2 is orthogonal to w. 25. v = 3i + j, w = - 2i - jdeal with the problem of solving Ax = b when det A = 0.22.Suppose that, for a given matrix A, there is a nonzero vector x such that Ax = 0. Show that there is also a nonzero vector y such that A*y = 0.If u = < 3 , 9 > and v = < -3, 1 >, find 1/3u - 2v. (this is a vector problem)
- In Problem ,use the vectors in the figure at the right to graph each of the following vectors. 3v + u - 2wQuestion B.3 Consider the minimization problem M(p, y) = min x U(x) s.t. p1 · x1 + ... + pn · xn ≤ y where U : Rn → R is continuous. Prove that the function M(p, y) : Rn + × R+ → R is quasi-concave. [Hint: the subscript + means that all elements of a vector are non negative and at least one is strictly larger than zero.]The matrix A = " 1 0 0 2 # is a linear map from R 2 to R 2 . Draw the modified shape of the circle x 2 + y 2 = 1 after applying A on R 2
- Suppose masses m1, m2, m3, m4 are located at positions x1, x2, x3, x4 in a line and connected by springs with constants k12, k23, k34 whose natural lengths of extension are l12, l23, l34. Let f1, f2, f3, f4 denote the rightward forces on the masses, e.g., f1 = k12(x2 - x1 - l12). (a) Write the 4 x 4 matrix equation relating the column vectors f and x. Let K denote the matrix in this equation. (b) What are the dimensions of the entries of K in the physics sense (e.g., mass times tim, distance divided by mass, etc.)? (c) What are the dimensions of det(K), again in the physics sense? (d) Suppose K is given numerical values based on the unit meters, kilograms, and seconds. Now the system is rewritten with a matrix K' based on centimeters, grams, and seconds. What is the relationship of K' to K? What is the relationship of det(K') to det(K)?Let A =[ 4 -1 2 , -1 8 3 ,1 -2 5 ] b=[1 ,-2,3] and initial vector x 0=[0,0,0,0] perform two itearation of the gauss seidel methodShow that the system x' =Ax has constant solutions otherthan x(t)= 0 if and only if there exists a (constant) vectorx ≠ 0 with Ax = 0. (It is shown in linear algebra that sucha vector x exists exactly when det(A) = 0.)
- A = 0 1 −2 1 −1 4 5 0 0 1 3 1 the preimage of (0, 0, 0) (If the vector has an infinite number of solutions, give your answer in terms of the parameter t.)s = (6 4 1) (3 −5 1) (8 13 6) (0 6 9) explain why S is not a basis for R3. (a) What is the 2 × 2 matrix P that projects v = x y onto the x axis, i.e. takes x y to x 0 ? Is P invertible? (b) Let ` be the line from problem 2(b). Find the 2 × 2 matrix that projects v = x y onto ` by using a composition method similar to problem 2(b). Please solve both part , thank you