1. What is the value of the expression below when $z^{\wedge} 2=-5$ ? Show the substitution.
operation
\[
z^{2}+3 z-7
\]

Answer

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Answer

$\boxed{3z - 12}$ is the final answer.

Steps

Step 1 ：Given the expression $z^{2}+3 z-7$ and the condition $z^{2}=-5$.

Step 2 ：Substitute $z^{2}=-5$ into the expression, we get $-5+3z-7$.

Step 3 ：Simplify the expression to get $3z - 12$.

Step 4 ：So, the value of the expression $z^{2}+3 z-7$ when $z^{2}=-5$ is $3z - 12$.

Step 5 ：$\boxed{3z - 12}$ is the final answer.