Question

Let f(w) = 2w^3 - 5. Let z = 2. What is f(z)?​

Answer 1

11

Explanation:

z = 2; therefore, f(z) = f(2).

The letter/number inside of the bracket replaces the orginal letter, in this case w.

f(w) = 2w^3 - 5

f(2) = 2(2)^3 - 5

f(2) = 2(8) - 5

f(2) = 16 - 5

f(2) = 11

As a result, f(z) = 11