Question 180999
{{{matrix(1,3,f(matrix(3,1,"",g(x),"")), "=", 3(x+2)^2-7)}}} 
<pre><font size = 4  color = "indigo"><b>
That's correct.  But then you went astray.
It should be:

{{{matrix(1,3,f(matrix(3,1,"",g(x),"")), "=", 3(x+2)(x+2)-7)}}}

{{{matrix(1,3,f(matrix(3,1,"",g(x),"")), "=", 3(x^2+4x+4)-7)}}}

{{{matrix(1,3,f(matrix(3,1,"",g(x),"")), "=", 3x^2+12x+12-7)}}}

{{{matrix(1,3,f(matrix(3,1,"",g(x),"")), "=", 3x^2+12x+5)}}}

Edwin</pre>