Question

Evaluate the summation of 2 times negative 2 to the n minus 1 power, from n equals 1 to 7..

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−84

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86

Answer 1

\[evaluate \sum_{n=1}^{7} 2(-2)^n-1\]

Answer 2

@YanaSidlinskiy @Keridavis

Answer 3

@FriedRice

Answer 4

sorry but i havent learned that yet

Answer 5

but let me study then ill teach you

Answer 6

just give me 10 min

Answer 7

ok

Answer 8

i just learned that to find the sum you need to use this formula \[S _{n} =\frac{ n }{ 2 }(a _{1} + a _{n})\]

Answer 9

ok

Answer 10

n = 7

Answer 11

a1 = 2(-2)^1 -1

Answer 12

an = 2(-2)^7 - 1

Answer 13

when you put that in the chart youll get your answer

Answer 14

thanks

Answer 15

yw