Question

How do you write the expression for the nth term of the sequence given `2, -4, 6, -8, 10,...`?

Answer 1

detail in explanation

Explanation:

case 1 you know how much is n
1.n is odd number then

`An=2+(n-1)*2`

2.n is even number then

`An=-4+(n-2)*(-2)`

case 2. n is unknown

`An=(2+2*(n-1))*(-1)^(n-1)`