Question 889219
<pre>
{{{4x^2-12x-112}}}

Factor out GCF 4

{{{4(x^2-3x-32)}}}

Think of two integers that multiply to give last term -32 
and which add to give middle coefficient -3.  They are -8 and +4.
So the factorization is

{{{4(x-8)(x+4)}}}

Edwin</pre>