Question

Write the sum using summation notation, assuming the suggested pattern continues. 9 - 18 + 36 - 72 + ...

Answer 1

next is +144

Answer 2

well the 1st term is 9 and then you multiply by -2

Answer 3

then -288

Answer 4

so using summation notation is

\[\sum_{n = 1}^{\infty} 9(-2)\]

you need to work out the power of -2

so when n = 1 you get 9
n = 2 you get 9 times (-2) = -18
n = 3 you get 9 times (-2) = 36

Answer 5

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