a) Suppose that A is the row vectorand B is an n × l matrix. View B as the column of row v...

a) Suppose that A is the row vector

and B is an n × l matrix. View B as the column of row vectors

where B1, B2, …, Bn are the rows of B. Show that

AB = a1B1 + a2B2 + … + anBn.

---

b) Use the result of part (a) to find AB for