document.write( "Question 554012: Solve for x:
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document.write( "Log2(11-6x) = 2Log2(x-1)+3 \n" );
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Algebra.Com's Answer #361158 by rapaljer(4671)![]() ![]() You can put this solution on YOUR website! \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "First get all the log terms on one side: \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "By the Law of Logarithms: \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "By another Law of Logarithms, combine into a single log: \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "By the Definition of Logarithms: \n" ); document.write( " \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Clear the fraction, by multiplying both sides by (x-1)^2:\r \n" ); document.write( "\n" ); document.write( "8(x-1)^2= 11-6x \n" ); document.write( "8(x^2-2x+1) =11-6x \n" ); document.write( "8x^2-16x+8+6x-11=0 \n" ); document.write( "8x^2-10x-3=0\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "What are the chances that, after ALL this work, the trinomial will factor?? They usually do, in this type of problem!!\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "(4x +1)(2x-3)=0\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "There are two solutions: x=-1/4 and x=3/2\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Of course, you can't have a log of a negative number, so x=-1/4 must be rejected. The other answer x=3/2 is acceptable.\r \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "You may want to see my FREE website for additional explanation on LOGARITHMS. The easiest way to find the website is to use the easy-to-remember and easy-to-spell link www.mathinlivingcolor.com. Near the bottom of this page is a link that takes you to my Homepage. On my Homepage, look for the link \"Basic, Intermediate, and College Algebra: One Step at a Time.\" \r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Choose \"College Algebra\" and look in Chapter 4 for the sections on Logarithms. I think you will really like the \"Math in Living Color\" pages that go with these sections. In addition, I have 2 FREE videos on this topic that was made in my younger years before I retired. To see the videos, look on my Homepage for the link \"Rapalje Videos in Living Color.\" Choose College Algebra, and look for the videos on \"Logarithms.\"\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "If you need to contact me, send me an Email at rapaljer@seminolestate.edu.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Dr. Robert J. Rapalje, Retired \n" ); document.write( "Seminole State College of Florida \n" ); document.write( "Altamonte Springs Campus \n" ); document.write( " |