What is the end behavior of the function f(x) = -3x4-x3 + 2x2 + 4x + 5?
-up on the left, up on the right
-up on the left, down on the right
-down on the left, up on the right
-down on the left, down on the right
-up on the left, up on the right
-up on the left, down on the right
-down on the left, up on the right
-down on the left, down on the right