SOLUTION: Hello, since I can't find an exponential equation topic, I'm going to ask here. What's the solution of the following equation? . the 2x+2 is above the '3', i put it in brackets for

Question 1075151: Hello, since I can't find an exponential equation topic, I'm going to ask here. What's the solution of the following equation? . the 2x+2 is above the '3', i put it in brackets for easier understandment. Thanks for your help! [somewhy it didn't allow me to put the equation in curly braces]
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
3(^2x+2)-28*3^x=-3
3^(2x+2)-28*3^x=-3

Sub u for 3^x

(9u - 1)*(u - 3) = 0
u = 3
3^x = 3
x = 1
===============
u = 1/9
3^x = 1/9
x = -2

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