document.write( "Question 1208826: Perform the indicated operation and express your answer in the form a + bi.\r
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Algebra.Com's Answer #847307 by ikleyn(52803)\"\" \"About 
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\n" ); document.write( "Perform the indicated operation and express your answer in the form a + bi.\r
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document.write( "(4 + 3i)*(3i - 4) = 4*3i - 4*4 +(3i)*(3i) - 3i*4 = 12i - 16 + 9i^2 - 12i = -16 + 9*(-1) = -16 - 9 = -25.\r\n" );
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document.write( "\"sqrt%28-25%29\" = +/- 5i.\r\n" );
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document.write( "ANSWER.  \"sqrt%28%284%2B3i%29%2A%283i-4%29%29\" = +/- 5i.\r\n" );
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document.write( "Thus  \"sqrt%28%284%2B3i%29%2A%283i-4%29%29\"  has two values:  one value is  5i  and  another value is  -5i.\r\n" );
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document.write( "In complete form a + bi,  first number is 0 + 5i;  the second number is 0 - 5i.\r\n" );
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document.write( "Do not be surprised: in complex domain, square root of non-zero number always has two values,\r\n" );
document.write( "and these two values are opposite (have opposite signs).\r\n" );
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document.write( "The same as in the real domain for positive numbers.\r\n" );
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