







The quadratic formula 
20130103 

From itsel: Find the discriminant ans use it to determine the use the quadratic formula to solve the equasion 2x^2+3x+2=0 Answered by Penny Nom. 





The discriminant 
20100117 

From Sonjonnia: What is the value of the discriminant?
16x^=16x4 Answered by Penny Nom. 





Values of k for which k(x^2+2x+3)  4x  2 is never negative 
20070629 

From claire: Find the range of values of k for which k(x^2+2x+3)  4x  2 is never negative. Answered by Harley Weston. 





The roots of (x  k)(13x) + 1 = 0 
20070628 

From Claire: Show that the roots of (x  k)(13x) + 1=0 are real and distinct for all real values of k. Hence, or otherwise, find the range of 9sin^2 r  6sin r + 13 Answered by Harley Weston. 





Discriminant 
20050620 

From A student: If a quadratic has real root, its discriminant b24ac>=0 Is there any similar condition or method by which you can find whether roots of a cubic equation are real or not? Answered by Chris Fisher. 

