Question 1118201
{{{x<>X}}}




{{{x(x+2)=20}}}
(No integer solution)



{{{x^2+2x=20}}}

{{{x^2+2x-20=0}}}

{{{x=(-2+- sqrt(2^2+4*20))/2}}}

{{{x=(-2+- sqrt(84))/2}}}

{{{x=(-2+- 2*sqrt(21))/2}}}

{{{highlight(x=-1+- sqrt(21))}}}