Question 391987
<pre>
Plug in this formula:

{{{(red(matrix(3,3, 

        a,b,c,
        d,e,f,
        g,h,j)))*(green( matrix(3,3,k,l,m,n,p,q,r,s,t) ) ) =

(matrix(3,3,
red(a)green(k)+red(b)green(n)+red(c)green(r),
red(a)green(l)+red(b)green(p)+red(c)green(s),
red(a)green(m)+red(b)green(q)+red(c)green(t),

red(d)green(k)+red(e)green(n)+red(f)green(r),
red(d)green(l)+red(e)green(p)+red(f)green(s),
red(d)green(m)+red(e)green(q)+red(f)green(t),

red(g)green(k)+red(h)green(n)+red(j)green(r),
red(g)green(l)+red(h)green(p)+red(j)green(s),
red(g)green(m)+red(h)green(q)+red(j)green(t))) }}}

and get

{{{(matrix(3,3, 3,4,-3,-1,7,-4,7,9,-6))}}}

Edwin</pre>