Question 1210332
<pre>

find PQ + 2Q.

{{{P=(matrix(2,2,2,4,-9,1))}}}

{{{Q=(matrix(2,2,1,-1,3,-2))}}}

{{{PQ+2Q=(matrix(2,2,2,4,-9,1))(matrix(2,2,1,-1,3,-2))+ 2(matrix(2,2,1,-1,3,-2))}}}{{{""=""}}}

{{{(matrix(2,2,(2)(1)+(4)(3),(2)(-1)+(4)(-2), (-9)(1)+(1)(3),(-9)(-1)+(1)(-2))))}}}{{{""+""}}}{{{(matrix(2,2,2(1),2(-1),2(3),2(-2)))}}}

{{{(matrix(2,2,2+12,-2-8, -9+3,9-2)))}}}{{{""+""}}}{{{(matrix(2,2,2,-2,6,-4))}}}

{{{(matrix(2,2,14,-10, -6,7)))}}}{{{""+""}}}{{{(matrix(2,2,2,-2,6,-4))}}}

{{{(matrix(2,2,14+2,-10-2,-6+6,7-4))}}}

{{{(matrix(2,2,16,-12,0,3))}}}

Edwin</pre>