Most of a message to me
... one question concerning problem 6. When in 640:250 Intro to Linear Algebra, they told us that the only time (at least the only time I can remember) that a 2x2 matrix is NOT invertible is when the determinant is equal to 0. In the problem you gave us, that leaves an infinite number of points where the matrix [3 A; 2 B] is invertible. Can you help narrow this down please?
Thanks for writing to me. Why shouldn't there be infinitely many such matrices which aren't invertible?
Hey, look at
I bet both of those aren't invertible! Let's see, for a 2-by-2 matrix, I think you can probably
I hope this message is helpful.
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