Question 374203
{{{x^2-3x -12 = 0}}}
{{{x^2-3x +9/4-12 = 9/4}}}
{{{(x-3/2)^2=9/4+12}}}
{{{(x-3/2)^2=9/4+48/4}}}
{{{(x-3/2)^2=57/4}}}
{{{x-3/2=0 +- sqrt(57)/2}}}
{{{highlight(x=3/2 +- sqrt(57)/2)}}}