10.6 Matrices on the calculator

This starts with a lecture. You have to show them how to do matrices on the calculator. They should be able to…

• Enter several matrices at once
• Add several matrices
• Subtract
• Multiply
• Find inverses

All of this is explained step-by-step in the“Conceptual Explanations.”

There are two things I stress. First, whenever I enter a matrix, I always check it. For instance, after I enter matrix [A], I go back to the home screen and go [A][Enter], and the calculator displays matrix [A]to me, so I can make sure I typed it right. One small mistype will ruin a whole problem, and it’s really easy to do!

Second, the calculator is very smart about interpreting equations. After you enter three matrices, you can just type [A][B]-1-[C] and it will multiply [A]by the inverse of [B] and then subtract [C].

Homework