Question

Cum se rezolva ecuatia : e^x + e^-x = 0 ?

Answer 1

$e^x+e^{-x}=0$
$e^x+\frac{1}{e^x}=0$
$\frac{e^{2x}}{e^x}+\frac{1}{e^x}=0$
$\frac{e^{2x}+1}{e^x}=0$
$e^{2x}+1=0$
$e^{2x}=-1$
$(e^x)^2=-1$
$e^x=\sqrt{-1}~care~nu~este~numar~real$