Share
Explore BrainMass

Matrices

Systems of Equations: Solve Using a Matrix Method

If an art dealer sold two artworks for $1520.00 thereby making a profit of 25% on the first piece of art and 10% on the second piece, if he had approached any exhibition he would have sold them together for $1535.00 with a profit of 10% on the first piece and 25% on the second, find the actual cost of each piece?

Matrix Reflection and Rotation

Given the 2x2 matrices A, B, and C (active transformation matrices) in the x, y plane do the following: (A, B and C are 2x2 matrices given below) 1. Show the matrix is orthogonal 2. Find the determinant to indicate if a rotation or reflection matrix 3. Find the rotation angle or find the line of reflection. A= 1/(2)

Invertible Matrices

Find all invertible matrices A of the form A =[a b] [c d] and satisfying A = A−1 and A^T = A^−1. Hint: The identity cos^2 t + sin^2 t = 1 may be useful.

Matrice and Rotating Vectors

Consider a circle with radius 1. The vectors OP and OQ shown in the diagram below are the unit vectors i and j rotated by angle t respectively.

Trees and Incidence Matrices

Let G be a graph with p vertices and p-1 edges. Prove that G is a tree iff any p-1 rows of the incidence matrix are linearly independent over Z/(2) (integers modulo 2).

Independence, span and rank of matrices

Let A be the following (2x3) matrix: 1 0 2 2 1 3 I would welcome an explanation of whether: - the columns of A are independent - the rows of A are independent - the columns of A span R2 or R3 - the rows of A span R3 - the rank of A is 1 or 2.

Use matrix to represent the weight and length

Animal Growth - At the beginning of a laboratory experiment, five baby rats measured. 5.6,6.4,6.9,7.6, and 6.1cm in length, and weighed 144, 138, 149, 152 and 146g, respectively. a). Write a 2*5 matrix using this information b). At the end of two weeks, their lengths ( in centimeters) were 10.2, 11.4, 11.4, 12.7, and 10.8 and

Together and Alone Problem : Solve by Matrix Methods

Four friends (Gauss, Euler, Cramer, and Einstein) can solve a 20 variable system in 11 hours. Gauss, Euler and Cramer can do it in 18 hours, while Euler, Cramer and Einstein take 16 hours. Gauss, Euler and Einstein can do it together in 14 hours. Define variables, set up a system, and using matrices, determine how long it tak

Matrix Determinants, Transposes and Inverses

If A and B are 3X3 matrices with Det(a)=2 and Det(b)=3 ... if possible evaluate the following expressions 1 Det(2AB) 2 Det(A^4 B^T a^-1) Where T is transpose and -1 is INVERSE

Coordinate Vectors, Transition Matrix and Basis

Let S= { (1, 2), (0, 1)} and T= { (1, 1), (2,3) } be bases for R^2 Let the Vector V=(1,5) and the vector W=(5,4) A. What are the coordinate vectors of V and W wrt to the basis T B. What is the transition matrix P from T to S basis? C. What are the coordinate vectors of V and W wrt to S (Using P from T to S basis)

Matlab : Inverse Operations

With given Eigenvalues λ = 6, -2, 2, 1, - 7 and with given Eigenvectors 5 * 5 matrix given below respectively 1 0 1 2 -1 2 2 1 0 2 3 0 1 2 -3 4 3 1 0 4 5 1 1 3 -5 1) Find inverse power method on (A-1) 2) Shifted inverse power method on (A - CI)-1 Write Matlab script on both the methods.

Matrices, Sets and Relations

Let: D = days of the week {M, T, W, R, F}, E = {Brian (B), Jim (J), Karen (K)} be the employees of a tutoring center at a University U = {Courses the tutoring center needs tutors for} = {Calculus I (I), Calculus II (II), Calculus III (III), Computers I (C1), Computers II (C2), Precalculus (P)}. We define the relation R

Matrices : Systems of Equations and Determinants

1. Solve the system of equations by using inverse matrix methods: 5x - y = 1 3x + y = 0 2. Find the determinant of matrix (should be brackets) -53 -96 9 2 Please see the attached file for the fully formatted problems.

Similar Transposes

Let N be an kxk matrix such that N^k=0 and N^(k-1) not equal to zero. Show that N and its transpose (N^t) are similar.

Find a matrix of projection pi

Find a matrix of projection pi onto subspace V parallel to subspace W in R3. See attached file for full problem description.

Row Equivalent Matrices and Systems of Equations

Determine the solutions of the system of equations whose matrix is row-equivalent to: Give three examples of the solutions. Verify that your solutions satisfy the original system of equations.

Matrix Questions

1.(a) If A is invertible and AB = AC, prove that B = C. (b) Let A =24 1 1 1 135 explain why A is not invertible. (c) Let A =24 1 1 1 135, ¯nd 2 matrices B and C, B 6= C such that AB = AC. 2. (a) If a square matrix A has the property that row 1 + row 2 = row 3, clearly explain why the matrix A is not invertible. (b)

Squaring Matrices

(a) Explain why for the product A^2 to make sense, that it is necessary that A be a square matrix. (b) Begin with (A - I)(A + I) = 0. Using the properties of multiplication and addition, show that any square matrix A that satisfies the equation (A - I)(A + I) = 0 also satisfies the condition A^2 = I. Justify each algebraic simp

Scalar Multiplication of Matrices

For what value of k does equality hold l 5 2 3 l l 1 2 3 l and l 1 2 4 l l 1 2 4 l l -10 3 4 l =k l -2 3 4 l ? l 3 6 9 l =k l 3 6 9 l l-15 4 5 l l -3 4 5 l l 0 5 0 l

Matrices

Find the two numbers whose sum is 76 and quotient is 18. Evaluate the determinate l 8 0 0 l l -16 7 8 l l 8 4 5 l FInd A-1(power) where A = l 2 4 l l 2 5 l

Unbounded Self Adjoint Operator.

Let H be the unbounded self-adjoint operator defined by -d^2/dx^2 (the negative of the second derivative with respect to x) on: D(H) ={f element of L^2 | Integral( |s^2 F f(s)|^2 )ds element of L^2} Where "F" denotes the Fourier Transform. Question: For the state vector h(x) = 1/sqrt(2) if x is in [0,2]

Invertible Matrix over Complex Numbers

Let A be a square n x n matrix over C[X] and write A = [pjk (X)] . For any z∈C( z being a complex variable) let A(z) := [pj k (z)] , that is a square n x n matrix over C. Show that matrix A is invertible if and only if matrix A(z) is invertible for all z from C. Will it be still valid if we change complex numbers into

Matrices and Pivot Positions : Solutions for Ax+0 and Ax=b

In problems 1-4 (a) does the equation Ax = 0 have a nontrivial solution and (b) does the equation the Ax = b have at least one solution for every possible b? 1) A is a 3x3 matrix with three pivot positions. 2) A is a 3x3 matrix with two pivot positions. 3) A is a 3x2 matrix with two pivot positions. 4) A is a 2x4 matrix

Matrices And Vectors : Matrix Products, Ax=B and Linear Combinations

Please see the attached file for the fully formatted problems. Compute the products using the row vector rule for computing Ax. If a product is undefined, explain why. 1) 2) 3) 4) let A = and b = . Show that the equation Ax=b does not have a solution for all possible b, and describe the set of all b f

Row Operations and Matrix Dimensions

Please see the attached file for the fully formatted problems. 6. Perform the row operation (-2) R1 + R2  R2 on the matrix . 8. What are the dimensions of the matrices shown below? a) b) 9. Find