Question 426931
I think it must be written {{{5y^2+by+2=0}}}
I shall write the answer for that.
Discriminant of {{{ax^2+bx+c=0}}}
is{{{b^2-4ac=41}}},with a=5,and c=2
that is
{{{b^2-4*5*2=41}}}
{{{b^2-40=41}}}
{{{b^2=41+40}}}
{{{b^2=81}}}
{{{b=+sqrt(81)}}} or {{{b=-sqrt(81)}}} 
that is
b=9 or b=-9