Let X∼Poisson(λ)X \sim \text{Poisson}(\lambda)X∼Poisson(λ). Find the expected value of X2X^2X2.
λ2+λ\lambda^2 + \lambdaλ2+λ
λ2\lambda^2λ2
λ\lambdaλ
\lambda(\lambda + 1)