Question 194783
{{{m^2+14m}}}
The is "complete the square" You do it
by taking 1/2 of the coefficient of the 
m term, which is {{{14}}}, and square it,
and add it as the 3rd term
{{{m^2 + 14m + (14/2)^2}}}
{{{m^2 + 14m + 49}}}
{{{(m + 7)^2}}}