Recent content by jj48

  1. J

    Undergrad Proving Subspace of a Matrix in R2

    thank you very much i got it
  2. J

    Undergrad Proving Subspace of a Matrix in R2

    thank you HallsofIvy you were right. I read wrong the question. it is if it is a subspace of the M(2,2), the vector space of all 2 by 2 matricess. How to i proof that they are close under adittion and multiplication and if i consider the set B = |B1 B2| B1 = 0 -6 -2 0 B2 = 2 4...
  3. J

    Undergrad Proving Subspace of a Matrix in R2

    Yes, you are right HallsofIvy. how i profe that they r close under multiplication and addition. do i have to add and them factorise to go back to the original?
  4. J

    Undergrad Proving Subspace of a Matrix in R2

    matrix a b c d
  5. J

    Undergrad Proving Subspace of a Matrix in R2

    Hi. if anybody can help me Let S be the matrix a b c d with a constrain a = -2d, b= 3c -d Prove that S is a subspace of R2?