Question

Write the first 5 terms of the sequence whose general term an

Answer 1

We will have that the first 5 terms of the sequence are:

`a_1=(-1)^1(9\cdot1)\Rightarrow a_1=-9`
`a_2=(-1)^2(9\cdot2)\Rightarrow a_2=18`
`a_3=(-1)^3(9\cdot3)\Rightarrow a_3=-27`
`a_4=(-1)^4(9\cdot4)\Rightarrow a_4=36`
`a_5=(-1)^5(9\cdot5)\Rightarrow a_5=-45`

So, the first five terms of the sequence are: -9, 18, -27, 36 & -45.