Evaluate the function at the indicated values. (If an answer is undefined, enter UNDEFINED.)

Question

Evaluate the function at the indicated values. (If an answer is undefined, enter UNDEFINED.)

k(x) = 2x³ − 4x²; k(a/2), k(-x), k(x^3)

Answer 1

I made a video, but the basic step is the same in each part:

Plug in the given value for x, and simplify the equation.

Answer 2

k(x) = 2x³ - 4x²

k(a/2) = 2(a/2)³ - 4(a/2)² = (1/4)a³ - a²

k(-x) = 2(-x)³ - 4(-x)² = -2x³ - 4x²

k(x³) = 2(x³)³ - 4(x³)² Simplify!