Linear Algebra Questions

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Questions and Answers

What value of $ heta$ will lead to a unique solution for the system of equations: $ heta x + 2y - 2z = 1$, $4x + heta y - z = 2$, $6x + 6y + z = 3$?

  • $ heta = 4$ (correct)
  • $ heta = 2$
  • $ heta = 6$
  • $ heta = 0$

Which of the following represents the necessary condition for $ rac{ rac{ ext{partial}^{2}f}{ ext{partial }x^{2}} + rac{ ext{partial}^{2}f}{ ext{partial }y^{2}} = 0$ for $f(x, y) = ext{log} ext{sqrt}(x^{2} + y^{2})$ to hold?

  • The partial derivatives must be constant.
  • The function must be linear.
  • The function is not defined at the origin.
  • The partial derivatives must be continuous. (correct)

For the function $f(x,y) = rac{xy(x^{2} - y^{2})}{x^{2} + y^{2}}$ when checking the limit as $(x,y) o (0,0)$, which limit approach is crucial?

  • Approaching along any linear path. (correct)
  • Approaching along the x-axis only.
  • Approaching along the y-axis only.
  • Approaching at equal rates in x and y.

What is the geometric multiplicity of an eigenvalue if the associated modal matrix does not have enough linearly independent eigenvectors?

<p>It is less than the algebraic multiplicity. (A)</p> Signup and view all the answers

Which of the following indicates that the system of equations is consistent: $x_1 + 2x_2 + x_3 = 2$, $2x_1 + 4x_2 + 2x_3 = 4$, $3x_1 + x_2 - 2x_3 = 1$, $4x_1 - 3x_2 - x_3 = 3$?

<p>The rank of the coefficient matrix equals the rank of the augmented matrix. (B)</p> Signup and view all the answers

Flashcards

Eigenvalues and Eigenvectors

Eigenvalues are the scalars that, when multiplied by a vector, result in a vector that points in the same direction.

Unique solution for equations

A system of linear equations has a unique solution when the determinant of the matrix formed by the coefficients is not zero.

Partial Derivatives of f(x,y)

The rate of change of a function f with respect to one variable at a time, while holding others constant.

Continuity

A function is continuous if the limit of the function at a point equals the function's value at that point.

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Gauss elimination method

A method for solving systems of linear equations that involves performing a series of row operations on an augmented matrix to achieve an upper triangular form.

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Study Notes

Q3 - Attempt Any Two Questions

  • Question 1: Find the value of λ such that the system of equations Ax + 2y - 2z = 1, 4x + λy - z = 2, 6x + 6y + λz = 3 has a unique solution.

  • Question 2: Prove that the function f(x, y) = log√(x² + y²) satisfies the given equation.

  • Question 3: Examine if the limit lim (x,y)→(0,0) (x³y-y⁴)/(x⁴+y⁴) exists for x ≠ 0, y ≠ 0.

Q4 - Compulsory

  • Part A:

    • A square matrix A is defined by A = [4 1] [2 3]
    • Find the modal matrix P and the resulting diagonal matrix D of A.
    • Determine the algebraic and geometric multiplicities of the eigenvalues.
  • Part B:

    • OR: Check if the following system of equations is consistent using Gaussian elimination:
      • x₁ + 2x₂ + x₃ = 2
      • 2x₁ + 4x₂ + 2x₃ = 4
      • 3x₁ + x₂ - 2x₃ = 1
      • 4x₁ - 3x₂ - x₃ = 3
    • OR: Test the continuity of f(x, y) = {(xy(x²-y²))/(x²+y²), when x ≠ 0, y ≠ 0} {0, when x = 0, y = 0}

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