document.write( "Question 870165: log2(x+3)+log2x=2 \n" ); document.write( "

Algebra.Com's Answer #524699 by Alan3354(69443) $\"\"$ $\"About$

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$\"log%282%2C%28x%2B3%29%29+%2B+log%282%2Cx%29+=+2\"$
\n" ); document.write( "Adding logs --> multiplication
\n" ); document.write( " $\"log%282%2Cx%2A%28x%2B3%29%29+=+2\"$
\n" ); document.write( " $\"log%282%2C%28x%5E2%2B3x%29%29+=+2\"$
\n" ); document.write( "Then,
\n" ); document.write( " $\"log%282%2C%28x%5E2%2B3x%29%29+=+log%282%2C4%29\"$
\n" ); document.write( " $\"x%5E2%2B3x+=+4\"$
\n" ); document.write( "Now it's a quadratic.
\n" ); document.write( "Check both zeroes, don't accept the log of a negative number.
\n" ); document.write( " \n" ); document.write( "

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