Carnegie Mellon

21-241 Matrix Algebra

Home Course Information Blog Schedule Policies

Assignments: Week #6


  • Monday: Section 3.3 (Also see posted notes on Matrix Algebra, section 4.4 Finding Inverse Matrices.)
  • Wednesday: Section 4.2. (Also see posted notes on Determinants, section 5.1 Properties of the Determinant.)
  • Friday: Section 4.2. (Also see posted notes on Determinants, section 5.2 Cofactor Expansion - Introduction.)


  • Wednesday: WeBWorK - Week #6 Online Homework.
  • Friday:
    1. Section 3.2 #32.
    2. Section 3.3 #44.
    3. Prove Proposition 5.5: The determinant is a linear function of each row of a matrix, when the other rows are held constant. (I gave a sketch in lecture. Write it out the way I did with the proof of Proposition 5.)

Homework assignments may be turned in before or after class on the due day, or may be placed in your TA's mailbox before 3:20pm on that day. The TA's mailboxes are in the Math Department office, WEH 6113.

Please make sure your homework includes the following:

  1. Your name (on every page if you ignore #4.),
  2. Your class section,
  3. The names of those students with whom you have collaborated,
  4. a staple.