Question 1163663
<pre>
{{{Area}}}{{{""=""}}}{{{abs(abs(matrix(1,3,a,x,b)))}}}

{{{matrix(1,3,a,x,b)}}}{{{""=""}}}{{{abs(matrix(3,3,i,j,k,x+1,1,-2,x,3,0))}}}{{{""=""}}}{{{abs(matrix(2,2,1,-2,3,0))i-abs(matrix(2,2,x+1,-2,x,0))j+abs(matrix(2,2,x+1,1,x,3))k}}}{{{""=""}}}


{{{((1)(0)-(-2)(3)^"")i-((x+1)(0)-(-2)(x)^"")j+((x+1)(3)-(1)(x)^"")}}}{{{""=""}}}


{{{(0+6^"")i-(0+2x^"")j+(3x+3-x^"")k}}}{{{""=""}}}{{{6i-2xj+(2x+3)k}}}


{{{Area}}}{{{""=""}}}{{{abs(abs(matrix(1,3,a,x,b)))}}}{{{""=""}}}{{{abs(abs(6i-2xj+(2x+3)k))}}}{{{""=""}}}{{{sqrt(6^2+(-2x)^2+(2x+3)^2)}}}{{{""=""}}}


{{{sqrt(36+4x^2+4x^2+12x+9)}}}{{{""=""}}}{{{sqrt(8x^2+12x+45)}}}{{{""=""}}}{{{41}}}

                               {{{sqrt(8x^2+12x+45)}}}{{{""=""}}}{{{41}}}
                                   {{{8x^2+12x+45}}}{{{""=""}}}{{{41^2}}}
                                   {{{8x^2+12x+45}}}{{{""=""}}}{{{1681}}}
                                   {{{8x^2+12x-1636}}}{{{""=""}}}{{{0}}}
                                   {{{2x^2+3x-409}}}{{{""=""}}}{{{0}}}
                                   {{{x = (-(3) +- sqrt( (3)^2-4(2)(-409)))/(2(2)) }}}
                                   {{{x = (-3 +- sqrt(3281))/(4) }}}

The positive solution is x = 13.57000349, approximately.

Edwin</pre>