document.write( "Question 186374: simplify sqrt81x^4 My instructor made this problem up it is not in my book \n" ); document.write( "
Algebra.Com's Answer #139676 by jim_thompson5910(35256)\"\" \"About 
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\n" ); document.write( "\n" ); document.write( "\"sqrt%2881%2Ax%5E4%29\" Start with the given expression.\r
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\n" ); document.write( "\n" ); document.write( "\"sqrt%2881%2Ax%5E2%2Ax%5E2%29\" Factor \"x%5E4\" into \"x%5E2%2Ax%5E2\". \r
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\n" ); document.write( "\n" ); document.write( "\"sqrt%2881%29%2Asqrt%28x%5E2%29%2Asqrt%28x%5E2%29\" Break up the square root using the identity \"sqrt%28A%2AB%29=sqrt%28A%29%2Asqrt%28B%29\".\r
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\n" ); document.write( "\n" ); document.write( "\"9%2Asqrt%28x%5E2%29%2Asqrt%28x%5E2%29\" Take the square root of \"81\" to get \"9\".\r
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\n" ); document.write( "\n" ); document.write( "\"9%2Ax%2Ax\" Take the square root of \"x%5E2\" to get \"x\".\r
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\n" ); document.write( "\n" ); document.write( "\"9x%5E2\" Multiply.\r
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\n" ); document.write( "\n" ); document.write( "Answer:\r
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\n" ); document.write( "\n" ); document.write( "So \"sqrt%2881%2Ax%5E4%29\" simplifies to \"9x%5E2\"\r
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\n" ); document.write( "\n" ); document.write( "In other words, \"sqrt%2881%2Ax%5E4%29=9x%5E2\" where \"x\" is non-negative.
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