InterviewSolution
Saved Bookmarks
| 1. |
If the equation 2^(2x)+a*2^(x+1)+a+1=0 has roots of opposite sign, then the exhaustive set of real values of a is |
|
Answer» `(-OO,0)` `implies t^(2)+2a*t+(a+1)=0` Now, `t=1` should lie between the roots of above EQUATION. Let `f(t)=t^(2)+2a*t+(a+1)` `:.f(1) lt 0` and `f(0) gt 0` `implies a lt (-2)/(3)` and `a gt -1` `:.a in (-1,(-2)/(3))` |
|