document.write( "Question 111239: Use a special product formula to factor the perfect square trinomial. \r
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\n" ); document.write( "\n" ); document.write( "b2 + 18b + 81\r
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Algebra.Com's Answer #81156 by elima(1433)\"\" \"About 
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b2 + 18b + 81
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\n" ); document.write( "(b+9)(b+9)
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