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jmhopkin
 Post subject: Algebra - q 37 solution quesiton p
PostPosted: Wed Apr 20, 2011 8:38 am 
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Joined: Tue Apr 19, 2011 12:46 pm
Posts: 2
Question: (3)^x - 3^(x-1)

In the solution it says to factor out 3^x such that the result would be 3^x(1 - 3^-1).

Is this really correct? If you worked backwards from this, wouldn't that actually result in

(3)^x - (9)^(x-1)
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VP_Help
 Post subject: Re: Algebra - q 37 solution quesiton p
PostPosted: Wed Apr 20, 2011 4:54 pm 
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Joined: Thu Feb 12, 2009 6:32 pm
Posts: 497
3^x - 3^(x-1) = 3^13 * 2

(3^(x-1) )(3 - 1) = 3^13 * 2

note: 3^(x-1) * 3 = 3^x


(3^(x-1) )(2) = 3^13 * 2

(3^(x-1) ) = 3^13

x - 1 = 13

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