Let X∼Poisson(λ)X \sim \text{Poisson}(\lambda)X∼Poisson(λ). Find the expected value of X3−3X2+2XX^3 - 3X^2 + 2XX3−3X2+2X.
λ3\lambda^3λ3
λ3−3λ2+2λ\lambda^3 - 3\lambda^2 + 2\lambdaλ3−3λ2+2λ
λ2\lambda^2λ2
\lambda