Question 975871
Description of the first member is overly-complicated.


<i>dividing 4 less than the square of a number by 2 more than than the number</i>


"...two more than the number...",
n+2


"...the square of a number...",
sqrt(n)


"...the square of a number by 2 more than than the number...",
recognize that "by" indicates DIVISION,
sqrt(n)/(n+2)


Now looking at the entire first-described member....
{{{(-4+sqrt(n))/(n+2)}}}
which now includes the first phrase of the problem description.
This member or expression can also be stated  {{{(sqrt(n)-4)/(n+2)}}}.


The member equal to that is given as 12.  Solve for n:
{{{highlight_green((sqrt(n)-4)/(n+2)=12)}}}