document.write( "Question 251237: find the real roots of the equation: {{81-9x^2=0}} \n" ); document.write( "
Algebra.Com's Answer #182955 by vksarvepalli(154)\"\" \"About 
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\"81-9x%5E2=0\"
\n" ); document.write( " so \"81=9x%5E2\"
\n" ); document.write( "that gives \"x%5E2=9\"\r
\n" ); document.write( "\n" ); document.write( "so (x-3)(x+3)=0\r
\n" ); document.write( "\n" ); document.write( "so the real roots are 3 and -3
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