document.write( "Question 1207459: Use z = a + bi to show that z double bars = z. \r
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Algebra.Com's Answer #845333 by ikleyn(52790)\"\" \"About 
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document.write( "First bar changes the sign of the term bi to opposite,\r\n" );
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document.write( "transforming  a+bi  to  a-bi.\r\n" );
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document.write( "Second bar changes the sign of the term (-bi) to opposite,\r\n" );
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document.write( "transforming  a-bi  to a - (-bi) = a+bi.\r\n" );
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document.write( "Thus doubled bar returns  a+bi  to its original form.\r\n" );
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