Give a numerical example of your choice to explain the expectation of a quadratic form x0ax, where x is a 3 × 1 random vector and a is a 3 × 3 symmetric matrix.

Describe the end behavior of the function below. f(x)=(2/3)^x-2 a. as x increases, f(x) approaches infinity. b. as x decreases, f(x) approaches 2. c. as x increases, f(x) approaches -2. d. as x decreases, f(x) approaches negative infinity.