Question 1071550
<pre>
{{{matrix(1,3,x^2+10x+25,""="",0)}}}

Compare to

{{{matrix(1,3,Ax^2+Bx+C,""="",0)}}}

The coefficient of x<sup>2</sup> is 1 understood:

{{{matrix(1,3,1x^2+10x+25,""="",0)}}}

{{{matrix(1,3,"A=1,","B=10,",C=25)}}}

{{{matrix(1,3,x,""="",(-B +- sqrt(B^2-4AC ))/(2A) )}}} 

{{{matrix(1,3,x,""="",(-10 +- sqrt(10^2-4(1)(25) ))/(2(1)) )}}} 

{{{matrix(1,3,x,""="",(-10 +- sqrt(100-100 ))/2 )}}}

{{{matrix(1,3,x,""="",(-10 +- sqrt(0 ))/2 )}}}

{{{matrix(1,3,x,""="",(-10 +- 0)/2 )}}}

{{{matrix(1,3,x,""="",(-10)/2 )}}}

{{{matrix(1,3,x,""="",-5 )}}}

Edwin</pre>