Linear Algebra 13d: Elementary Matrix Exercises

[TuneCX]

One might be interested in "Finding the nth term of a quadratic sequence", for example #28. Solving system of equations result in formula for nth term (n^2+n)/2, 10th term is (100+10)/2=55

[GordonYiu]

Thanks for sharing. May I know the software used here?

[vineetmukim]

Sir, in exercise 22 (11:48), since the RHS is not an identity matrix (hence, row or column operation choice does matter) and the unknown matrix is being operated by an elementary matrix from LHS, shouldn't we consider row operations and not column? The answer does not change though.