document.write( "Question 396669: Write 2 - 4 + 8 - 16 + ... + 128 using sigma notation. \n" ); document.write( "

Algebra.Com's Answer #281332 by CharlesG2(834) $\"\"$ $\"About$

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Write 2 - 4 + 8 - 16 + ... + 128 using sigma notation.\r
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\n" ); document.write( "\n" ); document.write( " $\"sum%28+-1%5E%28n%2B1%29%2A2%5En%2C+n=1%2C+7+%29\"$
\n" ); document.write( "n = 1 --> -1^(2) = 1, 2^1 = 2, 1 * 2 = 2
\n" ); document.write( "n = 2 --> -1^(3) = -1, 2^2 = 4, -1 * 4 = -4
\n" ); document.write( "n = 3 --> -1^(4) = 1, 2^3 = 8, 1 * 8 = 8
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\n" ); document.write( "n = 7 --> -1^(8) = 1, 2^7 = 128, 1 * 128 = 128
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