document.write( "Question 1198977: solve for x: 1+log2(x^2-4x-16)=log2(x^2-3x+4) \n" ); document.write( "
Algebra.Com's Answer #832669 by MathLover1(20850)\"\" \"About 
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\n" ); document.write( "solve for \"x\": \r
\n" ); document.write( "\n" ); document.write( "\"1%2Blog%282%2Cx%5E2-4x-16%29=log%282%2Cx%5E2-3x%2B4%29\"\r
\n" ); document.write( "\n" ); document.write( "\"1=log%282%2Cx%5E2-3x%2B4%29-log%282%2Cx%5E2-4x-16%29\"\r
\n" ); document.write( "\n" ); document.write( "\"1=log%282%2C%28x%5E2-3x%2B4%29%2F%28x%5E2-4x-16%29%29\"..........\"log%282%2C2%29=1\"\r
\n" ); document.write( "\n" ); document.write( "\"log%282%2C2%29=log%282%2C%28x%5E2-3x%2B4%29%2F%28x%5E2-4x-16%29%29\"\r
\n" ); document.write( "\n" ); document.write( "\"2=%28x%5E2-3x%2B4%29%2F%28x%5E2-4x-16%29\"\r
\n" ); document.write( "\n" ); document.write( "\"2%28x%5E2-4x-16%29=%28x%5E2-3x%2B4%29\"\r
\n" ); document.write( "\n" ); document.write( "\"2x%5E2-8x-32=x%5E2-3x%2B4\"\r
\n" ); document.write( "\n" ); document.write( "\"2x%5E2-8x-32-x%5E2%2B3x-4=0\"\r
\n" ); document.write( "\n" ); document.write( "\"x%5E2-5x-36=0\"..........use quadratic formula\r
\n" ); document.write( "\n" ); document.write( "\"x=%28-%28-5%29%2B-sqrt%28%28-5%29%5E2-4%2A1%2A%28-36%29%29%29%2F%282%2A1%29\"\r
\n" ); document.write( "\n" ); document.write( "\"x=%285%2B-sqrt%2825%2B144%29%29%2F2\"\r
\n" ); document.write( "\n" ); document.write( "\"x=%285%2B-sqrt%28169%29%29%2F2\"\r
\n" ); document.write( "\n" ); document.write( "\"x=%285%2B-13%29%2F2\"\r
\n" ); document.write( "\n" ); document.write( "solutions:\r
\n" ); document.write( "\n" ); document.write( "\"x=%285%2B13%29%2F2\"=>\"x=9\"\r
\n" ); document.write( "\n" ); document.write( "\"x=%285-13%29%2F2\"=>\"x=-4\"\r
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