1.

If `alpha, beta` are the roots of ` a x^2 + bx + c = 0` and `k in R` then the condition so that `alpha < k < beta` is :

Answer» a>0
c=x
f(x)<0
af(x)<0
`a^2k^2+abk+ac<0`
a<0
c=x
f(k)>0
af(x)<0
option 4 is correct.


Discussion

No Comment Found