## solving exponential equations: -6^(4x - 5) = -20

Quadratic equations and inequalities, variation equations, function notation, systems of equations, etc.
sully039
Posts: 16
Joined: Mon Jul 25, 2011 8:33 pm
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### solving exponential equations: -6^(4x - 5) = -20

So I'm stuck on this question: -64x-5=-20
I know that I'm supposed to use log to isolate the variable, but I can't take the log of a negative number.
Could someone please explain how to solve this in steps?

Thanks

little_dragon
Posts: 226
Joined: Mon Dec 08, 2008 5:18 pm
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### Re: solving exponential equations: -6^(4x - 5) = -20

So I'm stuck on this question: -64x-5=-20
I know that I'm supposed to use log to isolate the variable, but I can't take the log of a negative number.
no but U can multiply thru by -1 to get rid of the negs on both sides
then do logs

sully039
Posts: 16
Joined: Mon Jul 25, 2011 8:33 pm
Contact:

### Re: solving exponential equations: -6^(4x - 5) = -20

Oh...right I feel kinda dumb now lol

Thanks for the help

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