Question

Find the first four terms of the sequence given by the following.
a[n]=(-1)^(n+1)・2n^2,n=1,2,3..

HELPPPP ASAPPP

Answer 1

replace \(n\) by 1 get
\[(-1)^{1+1}(1+1)\times (2\times 1^2)\]
\[=(-1)^2\times 2\times 2\times 1\]
\[=4\]

Answer 2

others are similar

Answer 3

actually the 1st term is

\[(-1)^{1 +1} \times 2 \times 1^1\]

2nd term

\[(-1)^{2 +1} \times 2 \times 2^2\]

and just keep going