You can put this solution on YOUR website! Here's a similar problem:
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Find the solutions of the exponential equations.
e^2x-5e^x+4=0
Assuming you mean e^(2x)-5e^x+4=0
Sub u for e^x
--> u^2 - 5u + 4 = 0
Solve for u
Sub back e^x for u
etc