Recent content by collinito

  1. C

    Linear Algebra Help: Proving Theorem 3 for nxn Matrices

    Homework Statement Explain why, if A is an n by n matrix, and [1, . . . , 1] is a 1 by n matrix, then [1, . . . , 1]A will be a 1 by n matrix whose ith entry equals the sum of the entries in the ith column of A. Then use this idea to do the following problem. 1)Let P be an nxn...
  2. C

    Confusing Limit Problem: Solving lim[x→-2¯(from the left)] x+2/sqrt(x^2-4)

    l'hospital's doesn't work, I already tried it, you still get a zero on the bottom.
  3. C

    Confusing Limit Problem: Solving lim[x→-2¯(from the left)] x+2/sqrt(x^2-4)

    Homework Statement lim[x→-2¯(from the left)] x+2/sqrt(x^2-4)Homework Equations The Attempt at a Solution When I attempted this question I felt that the solution was that this is undefined and when i put it into my ti-89 it said that too. My friend argues that it's...