Question 250961
{{{ p^2 + 3p - 9 =0}}}
{{{(p^2 + 3p +9/4)- 9 =9/4}}}
{{{(p+(3/2))^2-9=9/4}}}
{{{(p+(3/2))^2=9/4+36/4}}}
{{{(p+(3/2))^2=45/4}}}
{{{p+(3/2)= 0 +- (3/2)*sqrt(5)}}}
{{{p=-(3/2) +- (3/2)*sqrt(5) }}}