Question

Evaluate 2y^3-z^2-1. When y = -5

Answer 1

Answer:

-z² - 251

Explanation:

The given expression is

$2y^3-z^2-1$

To evaluate when y = -5, we need to replace y with -5, so

$\begin{gathered} 2(-5)^3-z^2-1 \\ 2(-125)-z^2-1 \\ -250-z^2-1 \end{gathered}$

Then, add the like terms

$\begin{gathered} -z^2-250-1 \\ -z^2-251 \end{gathered}$

Therefore, the answer is

-z² - 251