Question

Write the sum using summation notation, assuming the suggested pattern continues.

2 - 8 + 32 - 128 + ...

Answer 1

@jim_thompson5910

Answer 2

@ikarus1991

Answer 3

@tcarroll010

Answer 4

please help me

Answer 5

so its this one?

Answer 6

but thats not one of the answers???

Answer 7

ok so is this the way u write it???

Answer 8

ok onesec

Answer 9

ok

Answer 10

its this one

Answer 11

G.P a=2,r=-8/2=-4
\[tn=a r ^{n-1}, series is \sum_{1}^{\infty}2\left( -4 \right)^{n-1} or \sum_{0}^{\infty}2\left( -4 \right)^{n}\]