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 Algebra Pre-Algebra and Basic Algebra Math Forum

 March 28th, 2015, 08:26 PM #11 Global Moderator   Joined: Dec 2006 Posts: 21,028 Thanks: 2259 Put $(-4)^n$ instead of $-4^n$ if using that method. Multiplying the original equation by 4 gives -8 + 32 - ... - x + 4x = 104856. Adding that to the original equation gives -2 + 4x = 131070, so x = 131072/4 = 32768. March 29th, 2015, 02:05 AM #12 Newbie   Joined: Mar 2015 From: Slovenia Posts: 6 Thanks: 0 Thank you all for your help,now I finally understand it perfectly  April 2nd, 2015, 01:47 PM #13 Newbie   Joined: Apr 2015 From: trung tam gioi thieu viec lam tri duc, ho chi minh Posts: 1 Thanks: 0 26214=−2×((−4)n−1)−5 26214×5/2=−1×((−4)n−1)−1=(−4)n−1 131070/2+1=(−4)n 65535+1=(−4)n 65536=(−4)n 48=(−4)n=4n (if n is even) n=8 yes very nice! Tags geometric, progression Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Similar Threads Thread Thread Starter Forum Replies Last Post jiasyuen Algebra 1 May 14th, 2014 08:19 AM jiasyuen Algebra 1 May 1st, 2014 03:40 AM Ter Algebra 2 April 13th, 2012 05:34 AM islam Number Theory 3 July 20th, 2011 06:39 AM MIDI Elementary Math 10 January 23rd, 2011 05:09 AM

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