InterviewSolution
Saved Bookmarks
InterviewSolution
| 1. |
The value (s) of k such that the equation kx2 + 6x + k = 0 has equal roots is ……………A) ± 3 B) ± 6 C) -6 and 3 D) 9 |
|
Answer» Correct option is (A) ± 3 For equal roots, we have Discriminant = 0 \(\Rightarrow6^2-4\times k\times k=0\) \(\Rightarrow36-4k^2=0\) \(\Rightarrow4k^2=36\) \(\Rightarrow k^2=9\) \(\Rightarrow\) k = \(\pm\,\,3\) Correct option is A) ± 3 |
|