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September 21st, 2013, 02:52 PM   #1
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Exponential

Hi guys, need help with...


(18-5^x)/5^x =5^x+2
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September 21st, 2013, 03:01 PM   #2
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Re: Exponential

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September 21st, 2013, 03:07 PM   #3
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Re: Exponential

Why did you write 5^2x and 3? Where did they come from?
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September 21st, 2013, 05:15 PM   #4
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Re: Exponential

I multiplied both sides of your equation by 5^x and then rearranged the terms.
5^x + 2 * 5^x = 3 * 5^x.
When multiplying exponentials with the same base, add the exponents: 5^x * 5^x = 5^(x + x) = 5^(2x).
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