document.write( "Question 429421: Solve using square roots:
\n" ); document.write( "-12 = x^2 - 21
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Algebra.Com's Answer #298274 by robertb(5830)\"\" \"About 
You can put this solution on YOUR website!
\"21+-+12+=+x%5E2\"\r
\n" ); document.write( "\n" ); document.write( "\"9+=+x%5E2\"\r
\n" ); document.write( "\n" ); document.write( "==> x = -3, 3
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