Question 870815
{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}}
discriminant is {{{sqrt( b^2-4*a*c )}}}
5x^2-10x-8=0
{{{sqrt( 100+160 ) = sqrt(260)}}}  
Two real solutions
y = 5(x-1)^2 -13