document.write( "Question 744481: 1. Solve the following equations
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document.write( "a) log x+1 = log 6 - log x
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document.write( "b) ln(x-2) +ln3 = ln(x+1)\r
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document.write( "Can you please help me out? Thanks so much in advance:)
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document.write( "Can you please show all the steps it would really help me understand:) \n" );
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Algebra.Com's Answer #453413 by ankor@dixie-net.com(22740)![]() ![]() You can put this solution on YOUR website! 1. Solve the following equations \n" ); document.write( "a) log x+1 = log 6 - log x \n" ); document.write( "Subtracting logs means divide so we can combine on the right to \n" ); document.write( "log(x+1) = \n" ); document.write( "if the logs are equal, the values are equal, therefore: \n" ); document.write( "x + 1 = \n" ); document.write( "multiply both sides by x \n" ); document.write( "x(x+1) = 6 \n" ); document.write( "arrange as a quadratic equation \n" ); document.write( "x^2 + x - 6 = 0 \n" ); document.write( "Factors to \n" ); document.write( "(x+3)(x-2) \n" ); document.write( "Two solutions \n" ); document.write( "x = -3 \n" ); document.write( "x = +2, this is the only solution, (we can't find the log of a neg number) \n" ); document.write( ": \n" ); document.write( "Check this on a calc: \n" ); document.write( " enter: log(2+1) results: .477.. \n" ); document.write( " then \n" ); document.write( " enter: log(6) - log(2): results: .477..; equality confirms our solution of x=2 \n" ); document.write( ": \n" ); document.write( ": \n" ); document.write( "b) ln(x-2) + ln(3) = ln(x+1) \n" ); document.write( "Adding logs is multiply, combine on the left \n" ); document.write( "ln(3(x-2)) = ln(x+1) \n" ); document.write( "ln(3x-6) = ln(x+1) \n" ); document.write( "therefore \n" ); document.write( "3x - 6 = x + 1 \n" ); document.write( "3x - x = 1 + 6 \n" ); document.write( "2x = 7 \n" ); document.write( "x = 7/2 \n" ); document.write( "x = 3.5 \n" ); document.write( ": \n" ); document.write( ": \n" ); document.write( "Check this on a calc replace x with 3.5: \n" ); document.write( "enter: ln(3.5-2) + ln(3); results: 1.504.. \n" ); document.write( "enter: ln(3.5+1); results: 1.504.. confirms our solution of x=3.5 \n" ); document.write( ": \n" ); document.write( "Are you understanding this better now? C \n" ); document.write( " \n" ); document.write( " |