If x2+2ax+b≥c, ∀x ∈ R, then
If the circles x2+y2+2ax+c=0 and x2+y2+2by+c=0 touch each other, then c is _________.where a & b ϵ R.
If x2+2ax+10−3a>0 for all x ∈ R, then