Re: jnuQ

Posted by Sinistral on May 08, 2013; 6:03am
URL: http://discussion-forum.276.s1.nabble.com/jnuQ-tp7580475p7580480.html

(64) coefficient of x^2 are of different sign implies one parabola faces upwards and the other faces downwards. ( -ve sign ==> downward and vice versa)

since discriminant is negative in both the cases implies that both parabolas do not touch or cut x axis.
hence one parabola will always remain above x axis (whose coefficient of x^2 >0) and the other will always remain below x axis (whose coefficient of x^2 < 0). therefore they will never intersect.

option (c)