PreCalculus - Logarithmic & Exponential Functions (3 of 20) x=? for [e^(2x)]-(3e^x)-10=0

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In this video I will find x=? for [e^(2x)]-(3e^x)-10=0.

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I get really confused at 49 seconds when -10 and -3 have powers and all of a sudden become -5. Please explain what is happening there!

primeribb
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hi professor Biezen, why can't I move 10 to the other side and take natural log on both side?

schemingfrog
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But how does the 2x become x squared tho?

cinquain