Question 176588
{{{x^2+(13/2)x-13=0}}}
So far so good.
Next step, use the quadratic formula which solves for zeros of a general quadratic equation,
{{{ax^2+bx+c=0}}}
with the appropriate values for a,b, and c.
{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}}
Re-post if you need more help.