document.write( "Question 370322: log(x^2-2x-31)/log(2)=2 \n" ); document.write( "

Algebra.Com's Answer #263925 by Fombitz(32388) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"log%28%28x%5E2-2x-31%29%29%2Flog%28%282%29%29=2\"$
\n" ); document.write( " $\"log%28%28x%5E2-2x-31%29%29=2%2Alog%28%282%29%29\"$
\n" ); document.write( " $\"log%28%28x%5E2-2x-31%29%29=log%28%282%5E2%29%29\"$
\n" ); document.write( " $\"x%5E2-2x-31=4\"$
\n" ); document.write( " $\"x%5E2-2x-35=0\"$
\n" ); document.write( " $\"%28x-7%29%28x%2B2%29=0\"$
\n" ); document.write( "Two solutions:
\n" ); document.write( " $\"x-7-0\"$
\n" ); document.write( " $\"x=7\"$
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\n" ); document.write( "\n" ); document.write( ".
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\n" ); document.write( " $\"x%2B2=0\"$
\n" ); document.write( " $\"x=-2\"$
\n" ); document.write( "However the negative value leads to a negative argument for the log function which is undefined.
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\n" ); document.write( " $\"highlight%28x=7%29\"$ \r
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