Question

use the formula to evaluate the series 1-2+4-8+ ...a^10

Answer 1

please help

Answer 2

\(\begin{array}{rrllll}
1&\\
-2&\implies 1\cdot -2\\
4&\implies -2\cdot -2\\
-8&\implies 4\cdot -2
\end{array}\)

what do you think?

Answer 3

-2x-4x-8

Answer 4

well.. notice that the next term is just the previous one multiplied by -2

Answer 5

so -8x2 then 16x2

Answer 6

notice that the next term is just the previous one multiplied by \(\bf \color{red}{-2}\)

Answer 7

sorry

Answer 8

I don't get this. Thanks for helping

Answer 9

the next one will be -8 * -2 = 16
then the next one will be 16 * -2 = -32

Answer 10

\(\large a^{10}\) just means the 10th term in the sequence