document.write( "Question 1040495: Multiply and simplify: (4 + 3i)(9 + 7i).
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Algebra.Com's Answer #655351 by ikleyn(52803) $\"\"$ $\"About$

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\n" ); document.write( "Multiply and simplify: (4 + 3i)(9 + 7i).
\n" ); document.write( "Write the answer in the form a + bi, where a and b are real numbers.
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\n" ); document.write( "\n" ); document.write( "Read attentively my answer:\r
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document.write( "(4 + 3i)(9 + 7i) = 4*9 + 4*(7i) + (3i)*9 + (3i)*(7i) = \r\n" );
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document.write( "                   36  +  28i   +  27i   +   21*i^2  =    ( now recall that  = -1 and replace  by (-1) )\r\n" );
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document.write( "                   36     +   55i        +   21*(-1) =\r\n" );
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document.write( "                   36     +   55i        -   21      =\r\n" );
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document.write( "                   (36-21) +  55i                    =\r\n" );
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document.write( "                    15     +   55i.\r\n" );
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document.write( "Answer.      15 + 55i.\r\n" );
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