Question 1159573
{{{ (matrix(2,2,x,3,y,2)) }}}{{{ (matrix(2,2,x,3,y,2)) }}} = {{{ (matrix(2,2,x^2+3y,3x+6,xy+2y,3y+4)) }}}

From this, you can get four equations

1) {{{ x^2+3y = x}}}
2) {{{ 3x+6 = 3 }}}
3) {{{ xy+2y = y }}}
4) {{{ 3y+4 = 2 }}}

(2) ==> x=-1
(4) ==> y=-2/3

You can verify (1) & (3) hold, as does  
{{{ (matrix(2,2,-1,3,-2/3,2)) }}}{{{ (matrix(2,2,-1,3,-2/3,2)) }}} = {{{ (matrix(2,2,-1,3,-2/3,2)) }}}