Question 193499
1) factoring {{{(x-13)(x+3)=0}}}
:
2) completing the square
:
   {{{(x^2-10x+25)-25-39=0}}}
   {{{ (x-5)^2-64=0}}}
   {{{ (x-5)^2-8^2=0}}}
   {{{(x-5+8)(x-5-8)=0}}}
   {{{(x+3)(x-13)=0}}}
:
3) quadratic formula
 *[invoke solve_quadratic_equation 1, -10, -39]