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+9
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avatar+1005 

Here is a question I did when learning algebra thorugh the AoPS Intro to Algebra TEXTBOOK

 

Don't worry, this is from the textbook I'm self-learning and I've solved it.

 

This is also from an AMC12 so it's not a violation of copyright since I'm citing it

 

It's good for a exponent refresher.

 

Latex isn't working so here's the photo.

 

 

This should be relatively easy for the moderators and probably some of the regular users too

 

I did it in 3 minutes, my parents in like 30 seconds LOL

 

laugh

off-topic
 May 14, 2020
edited by hugomimihu  May 14, 2020
edited by hugomimihu  May 14, 2020
 #1
avatar+129899 
+3

     5^(48/x)                             1

_________________ =        ____

5^(26/x) * 25^(17/x)               25^2

 

 

5^(48/x - 26/x)                     1

_____________ =          ______ 

    (5^2)^(17/x)                   25^2

 

 

5^( 22/x)                       1

_______   =             ________              

5^(34/x)                     (5^2)^2

 

 

   1                             1

_______   =          _____

5^(12/x)                   5^4

 

Which implies that    12/x = 4     ⇒   x  = 3

 

 

cool cool cool

 May 14, 2020
 #2
avatar+1005 
+1

THis is how I did it(or similar, this is from a few days ago, doing it now)

 

So we first convert all 25^whatevers into 5^somethings

 

so

 

5^-4 = 5^48/x OVER 5^26/x * 5*34/x = 5 ^(48-26-34)x = 5^-12x

 

so -12x = -4, x = 3

 

essentially the same as what you did

 

laugh

 

And also I'd nominate your answer for "Best Answer"

hugomimihu  May 14, 2020
edited by hugomimihu  May 14, 2020

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