Question

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

Answer 1

f(z)=2z^3 - 5

so

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

=32-5

=27

hope you got your answer!

Answer 2

Answer:  The required value of f(z) at z = 2 is 11.

Step-by-step explanation:  We are given the following function :

$f(w)=2w^3-5~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(i)$

We are to find the value of f(z) if z = 2.

From equation (i), we can write

$f(z)=2z^3-5.$

Therefore, at z = 2, we get

$f(2)=2\times2^3-5=16-5=11.$

Thus, the required value of f(z) at z = 2 is 11.