# Math Help - exponentials

1. ## exponentials

i need to solve this giving and exact solution...

2e^(x) + 3e^(-x)=7

thanks

2. Originally Posted by pop_91
i need to solve this giving and exact solution...

2e^(x) + 3e^(-x)=7

thanks
Let $e^x = u
$

$2u + \frac{3}{u} = 7$

3. Originally Posted by e^(i*pi)
Let $e^x = u
$

$2u + \frac{3}{u} = 7$
Further hint: Multiply both sides of the equation by $u$.

4. major thanks guys