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# i really need the help

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Use sigma notation to represent the following series for the first 12 terms.

2 +(-8) +32 + (-128) + ......

May 2, 2018

#1
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∑[ (-1)^(n + 1) 2^(2n - 1)], n=1 to 12 = - 6,710,886

May 2, 2018
#2
+20831
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Use sigma notation to represent the following series for the first 12 terms.
2 +(-8) +32 + (-128) + ......

$$\displaystyle -\frac{1}{2}\sum \limits_{n=1}^{12}(-4)^n$$

May 3, 2018