document.write( "Question 740142: The square of a number decreased by 4 times the number equals 21. Find the number \n" ); document.write( "
Algebra.Com's Answer #451506 by powercenter(3)\"\" \"About 
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x= the number \r
\n" ); document.write( "\n" ); document.write( "x^2-4x=21
\n" ); document.write( "x^2-4x-21=0\r
\n" ); document.write( "\n" ); document.write( "(x+3)(x-7)=0
\n" ); document.write( "x=-3
\n" ); document.write( "x=7
\n" ); document.write( "
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