Question

PLS HELP!!!!!!!!!!!!!
Write the recursive rule for the sequence: 5, -10, 20, -40, 80

Answer 1

We observe that this is a GP with:

• the first term t₁ = 5
• common ratio r = -2

The nth term is:

• tₙ = t₁rⁿ⁻¹
• tₙ = 5(-2)ⁿ⁻¹