Question

$P(x)=x+x^2+x^3+...x^{2023}$. What number is P(-1)

• A. 2023
• B. -2023
• C. 0
• D. -1

Answer 1

Answer:

D. -1

let x = -1

$(-1)+(-1)^2+(-1)^3+....+(-1)^{2022}+(-1)^{2023}$

$=-1+1-1+1...-1$

$=-1$