document.write( "Question 371941: Solve the following logarithmic equation. Check all solutions.
\n" ); document.write( "log(x)+log(x+21)=2 \n" ); document.write( "

Algebra.Com's Answer #264956 by Fombitz(32388) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"log%2810%2C%28x%29%29%2Blog%2810%2C%28x%2B21%29%29=2%29\"$
\n" ); document.write( " $\"log%2810%2C%28x%28x%2B21%29%29%29=2%29\"$
\n" ); document.write( " $\"x%28x%2B21%29=10%5E2\"$
\n" ); document.write( " $\"x%5E2%2B21x=100\"$
\n" ); document.write( " $\"x%5E2%2B21x-100=0\"$
\n" ); document.write( " $\"%28x%2B25%29%28x-4%29=0\"$
\n" ); document.write( "Two solutions but only the positive value is allowed because the log function requires positive arguments.
\n" ); document.write( " $\"x-4=0\"$
\n" ); document.write( " $\"highlight%28x=4%29\"$
\n" ); document.write( " \n" ); document.write( "

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