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If all real values of x obtained from the equation 4^x – (a – 3)2^x +a – 4 = 0 are non – positive then a lies in a)(4,5] b)(0,4) c)(4,infinity) d)none of these

```
2 years ago

Arun
25333 Points
```							let 2^x = t then t^2 – (a – 3)t + a – 4 = 0 t^2  + t – (a – 4)t + a – 4 = 0 t (t + 1) – (a – 4) (t + 1) = 0 t = – 1 and t = a – 4 2^x = a – 4 0 4
```
2 years ago
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• 101 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions