document.write( "Question 144492: i know (-6i) (-6i) is -36 but i don't know why. i can't seem to find out what i means.. negateve times negative , i thought was positive \n" ); document.write( "
Algebra.Com's Answer #105236 by jim_thompson5910(35256)\"\" \"About 
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\"%28-6i%29%2A%28-6i%29\" Start with the given expression\r
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\n" ); document.write( "\n" ); document.write( "\"%28-6%2A-6%29%2A%28i%2Ai%29\" Group like terms\r
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\n" ); document.write( "\n" ); document.write( "\"36%2A%28i%2Ai%29\" Multiply -6 and -6 to get 36\r
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\n" ); document.write( "\n" ); document.write( "\"36%2A%28i%5E2%29\" Multiply i and i to get \"i%5E2\"\r
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\n" ); document.write( "\n" ); document.write( "\"36%2A%28-1%29\" Replace \"i%5E2\" with -1. Remember, \"i%5E2=-1\"\r
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\n" ); document.write( "\n" ); document.write( "\"-36\" Multiply\r
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\n" ); document.write( "\n" ); document.write( "So \"%28-6i%29%2A%28-6i%29=-36\"\r
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