I'm trying to solve this :
assume: a*x^2+b*x+c>=0 for all x with a≠0 then have: b^2-4*a*c<=0
but I couldn't. I proved it when the quadratic equation is greater than zero
a*x^2+b*x+c>0 for all x with a≠0
but not for greater then or equal to zero. So any one help in solving this please.
Edited by O.J, 8 June 2016 - 03:38 PM.