Question 960248
 y=2n^2+2n-24 
solve for n using quadratic formula:
{{{n = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}}
a=coefficient of n^2 =2
b=coefficient of n=2 
c=constant=-24
{{{n = (-2 +- sqrt( 2^2-(4*2*-24)))/(2*2) }}}
{{{n = (-2 +- sqrt(196))/(4) }}}
{{{n = (-2 +- 14)/(4) }}}
n=-16/4=-4
or
n=12/4=3