Question

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

Answer 1

-z² - 251

Step-by-step 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