document.write( "Question 818379: The square of 9 more than a number is equal to 9 more than the square of the number. What is the number? \r
\n" ); document.write( "\n" ); document.write( "i tried but couldn't find the answer :(
\n" ); document.write( "thought was nine at first so i tried ( i'm home schooled and it tells you if your wrong or right on practice test )
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Algebra.Com's Answer #492505 by richwmiller(17219)\"\" \"About 
You can put this solution on YOUR website!
(n+9)^2=n^2+9\r
\n" ); document.write( "\n" ); document.write( "n^2+18n+81=n^2+9
\n" ); document.write( "18 n+72 = 0
\n" ); document.write( "n=-4
\n" ); document.write( "check
\n" ); document.write( "25=25
\n" ); document.write( "ok
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