Math Is Fun Forum

mom

Member

Registered: 2012-04-25

Posts: 94

Find the entry in the second row, first column of AB

Please let me know if I did this correctly.

I have Let A = [1 4] and B = [3 -2]. find the entry in the second row, first column of AB.
                       2 3                4  6

I multiplied A and B to get AB and the number I got for the second row, first column of AB was 18. Did I do this correctly?

Bob

Administrator

Registered: 2010-06-20

Posts: 10,619

Re: Find the entry in the second row, first column of AB

That looks good to me. 

Bob

---

Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you!  …………….Bob

mom

Member

Registered: 2012-04-25

Posts: 94

Re: Find the entry in the second row, first column of AB

Bob,

nice! thanks so much for checking it for me.