Question 138808
I'm not sure if I am putting this problem in the right spot. But could I get some help on it. It is from a homework sheet.
Find the minor for the element in the first row and second column of the given matrix.

<pre><font size = 4 color = "indigo"><b>

{{{(matrix(3,3,11,-11,20,-3,19,16,4,6,-8))}}}

The first row are the numbers across the top: {{{matrix(1,3,11,-11,20)}}}

The second column are the numbers down the middle: {{{matrix(3,1,-11,19,6)}}}

So the element in the first row and second column is the number {{{-11}}}

Let's cross out all the elements in the first row and the second column:

{{{(matrix(3,3,cross(11),cross(-11),cross(20),-3,cross(19),16,4,cross(6),-8))}}}

Now copy those numbers not crossed out into a 2x2 matrix:

{{{(matrix(2,2,-3,16,4,-8))}}} 

That 2x2 matrix is the minor matrix of -11.

Edwin</pre>