document.write( "Question 354826: I need help, step by step on how to solve ln (x +7) + ln (x + 3) = ln 77 \n" ); document.write( "

Algebra.Com's Answer #253515 by Fombitz(32388) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"+ln%28x+%2B7%29+%2B+ln%28x+%2B+3%29+=+ln%2877%29\"$
\n" ); document.write( " $\"+ln%28%28x+%2B7%29%28x+%2B+3%29%29+=+ln%2877%29\"$
\n" ); document.write( " $\"%28x+%2B7%29%28x+%2B+3%29+=+77\"$
\n" ); document.write( " $\"x%5E2%2B3x%2B7x%2B21=77\"$
\n" ); document.write( " $\"x%5E2%2B10x%2B21=77\"$
\n" ); document.write( " $\"x%5E2%2B10x=56\"$
\n" ); document.write( " $\"x%5E2%2B10x%2B25=56%2B25\"$
\n" ); document.write( " $\"%28x%2B5%29%5E2=81\"$
\n" ); document.write( " $\"x%2B5=0+%2B-+9\"$
\n" ); document.write( " $\"x=5+%2B-+9\"$
\n" ); document.write( " $\"x1=14\"$ and $\"x2=-4\"$
\n" ); document.write( ".
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\n" ); document.write( "However since $\"ln%28-4%2B3%29=ln%28-1%29\"$ is undefined, only $\"highlight%28x=14%29\"$ is a valid solution. \n" ); document.write( "

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