AOD
After derivating fx, we get a quqdratic. Now uska D<0 karna ha. After doing that i got (c+1)^2<16. Which gives me -5<c<3. Whats wrong?
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@Apu
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D<0 aadhi condition hai, you have to also consider cases when roots of quadratic are non-positive.
(Since e^x>0 for all x)