document.write( "Question 923193: -10, 20, -40, 80 \n" ); document.write( "
Algebra.Com's Answer #559904 by MathLover1(20850)\"\" \"About 
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{ \"-10\", \"20\", \"-40\", \"80\"......}\r
\n" ); document.write( "\n" ); document.write( "all given terms are divisible by \"5\":\r
\n" ); document.write( "\n" ); document.write( "\"-10=5%2A%28-2%29\"\r
\n" ); document.write( "\n" ); document.write( "\"20=5%2A4=5%2A%28-2%29%5E2\"\r
\n" ); document.write( "\n" ); document.write( "\"-40=5%2A8=5%2A%28-2%29%5E3\"
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\n" ); document.write( "in general:\r
\n" ); document.write( "\n" ); document.write( "\"a%5Bn%5D+=+5%28-2%29%5En\" for \"n\"={ \"1\",\"2\",....,\"a%5Bn%5D\" } \r
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\n" ); document.write( "\n" ); document.write( "check:\r
\n" ); document.write( "\n" ); document.write( "\"a%5Bn%5D+=+5%28-2%29%5En\" for \"n=1\"\r
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\n" ); document.write( "\n" ); document.write( "\"a%5B1%5D+=+5%28-2%29%5E1=5%28-2%29=-10\"\r
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\n" ); document.write( "\n" ); document.write( "\"a%5Bn%5D+=+5%28-2%29%5En\" for \"n=2\"\r
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\n" ); document.write( "\n" ); document.write( "\"a%5B2%5D+=+5%28-2%29%5E2=5%2A4=20\"\r
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\n" ); document.write( "\n" ); document.write( "\"a%5Bn%5D+=+5%28-2%29%5En\" for \"n=3\"\r
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\n" ); document.write( "\n" ); document.write( "\"a%5B3%5D+=+5%28-2%29%5E3=5%2A%28-8%29=-40\"\r
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\n" ); document.write( "\n" ); document.write( "\"a%5Bn%5D+=+5%28-2%29%5En\" for \"n=4\"\r
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\n" ); document.write( "\n" ); document.write( "\"a%5B4%5D+=+5%28-2%29%5E4=5%2A16=80\"\r
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