Fill in the blanks using the function below to describe the end behavior.
As x approaches - ∞, f(x) approaches _
a. infinity
b. negative infinity
c. -5
As x approaches ∞, f(x) approaches _
a. negative infinity
b. infinity
c. -5
As x approaches -∞, f(x) approaches b. negative infinity.
As x approaches ∞, f(x) approaches b. infinity.