Question 1035205
Easier to find roots to help in factoring.  You might use less advanced method by splitting the 40 into combinations as
<pre>
{{{1*40}}}
{{{2*20}}}
{{{4*10}}}
{{{5*8}}}
</pre>
Work with those if you want to.


Roots:
{{{(-102+- sqrt(102^2-4*5*40))/10}}}
{{{(-102+- sqrt(9604))/10}}}
{{{(-102+- 98)/10}}}
-200/10  or  -4/10
-20  or -2/5


{{{highlight(A=5(x+20)(x+2/5))}}}