Question 329286
{{{x^2-x-42=0}}}
{{{(x^2-x+1/4)-42=1/4}}}
{{{(x-1/2)^2=168/4+1/4}}}
{{{(x-1/2)^2=169/4}}}
{{{x-1/2=0 +- 13/2}}}
{{{x=1/2 +- 13/2}}}
{{{x=14/2}}} and {{{x=-12/2}}}
{{{x=7}}} and {{{x=-6}}}