# Exponential & Logarithmic Equations

• Mar 14th 2013, 09:05 AM
paigesisco
Exponential & Logarithmic Equations
3e^(4x)-9e^(2x)-15=0
I tried to solve this question and I couldn't finish solving it. Can you please show me how i would do this?
• Mar 14th 2013, 09:07 AM
Plato
Re: Exponential & Logarithmic Equations
Quote:

Originally Posted by paigesisco
3e^(4x)-9e^(2x)-15=0
I tried to solve this question and I couldn't finish solving it. Can you please show me how i would do this?

Can you solve $\displaystyle 3y^2-9y-15=0~?$
• Mar 14th 2013, 09:13 AM
paigesisco
Re: Exponential & Logarithmic Equations
• Mar 14th 2013, 09:15 AM
Shakarri
Re: Exponential & Logarithmic Equations
Quote:

Originally Posted by paigesisco

When solving it plato's way did you remember to find x after you found the value(s) of y?
• Mar 14th 2013, 09:19 AM
paigesisco
Re: Exponential & Logarithmic Equations
Yes i did that. Can you solve the equation out for me fully so that i can understand it in former questions
• Mar 14th 2013, 09:24 AM
Plato
Re: Exponential & Logarithmic Equations
Quote:

Originally Posted by paigesisco
Yes i did that. Can you solve the equation out for me fully so that i can understand it in former questions

You should get $\displaystyle e^{2x}=\frac{3+\sqrt{29}}{2}$.